Recently I obtained a trial portal to add to my CRM Online trial organization. I thought I would share the process with you in the event you would like to try it out. Note, this is the process at the time of this writing. This process could change at any time.
The first step is to create a CRM Online trial, complete the setup and sign in. Next, make a request for a Portal trial. You can do that by selecting this link and completing the information on the page. You’ll receive a follow-up email after you complete the sign-up request.
If your trial request is accepted, you’ll receive an email with an activate link. Select the Activate button, and you’ll be taken to a page where you can choose to add the Portal to your existing trial [CRM Online] or create a new one. Select Add Existing, if you have a trial or New if not. If you accidently select New, not to worry as you’ll have the option on the page to sign into an existing CRM Online trial or create a new one.
Note: At the time of this writing, you must select Add Existing for the Portal Trial to work as expected.
I signed in with my existing trial. You’ll be asked to confirm your order by selecting the Add button and on the order receipt page the Continue button.
Tip: If the order receipt includes a message to assign the users a license you can ignore that as it is not required (see below)
After selecting Continue, you’ll be taken to your Office 365 Home page. If not, log into Office 365 and select CRM from the Admin Centers on the left navigation menu and you’ll be taken to your CRM Instance.
Highlight the instance you want to work with and select applications from the top navigation menu. In this example I have only one instance so it was automatically selected for me.
On the Applications tab you will see the Portal Add-on. If you don’t see the Portal Add-on then something didn’t go as expected during the setup process. You’ll need to go back and check your request for a Portal or open a support ticket for assistance.
Select the Manage button to begin the initial Portal setup.
Tip: Note the status of the Portal is NotConfigured
On the next page you will enter information regarding the portal configuration.
Here is where you will give your portal a Name, Portal URL (enter the value you want for the URL and the portal will confirm if it is available or not), select your Portal Audience and the type of portal to be deployed. In this example, the Portal Audience is customer and Portal to be deployed is Community. Select the Submit button, at the bottom of the page, and select accept for the Terms of Service window dialog
The configuration will begin and might take a few minutes to complete. Stay on the screen until completion.
After completion you will be asked to log back into Office 365. At this point, you will be asked to give the Portal Add-on permissions that are required for the application to run. Select Accept
The Portal Add-on is now working through the final stages of configuration and setup. Give it the necessary time to complete.
Tip: If you select Portal Details, it will take you back to the screen where you entered your initial portal configuration information. If you select Submit again, it will display a message that the URL is already in use.
You can check on the status by returning to Office 365, Admin Center, CRM, select the CRM instance then select the Applications button, select Manage and you should see a link to your Portal URL. If you don’t see it, give it some additional time to complete the configuration and check back.
Note: Your Portal URL should be in the following format: https:<nameYouProvided>.microsoftcrmportals.com
That’s it; you’re now ready to begin configuring your Portal for others to access. Below are a couple of resources to help you get started with the Microsoft Dynamics Portal solution.
Administrator’s Guide to portal capabilities for Microsoft Dynamics CRM
Cheers
Donna Edwards 
Thank you for your business lessons, you helped me a lot.
Thanks for sharing great tips, This step-by-step installation helped me a lot.