Follow the below steps to see the portal user profile information in CRM.
Step 1: Login Dynamics CRM Organization in which the Dynamics CRM Portal configured.
Step 2: Navigate to CRM Contact records and open the required record to check the portal user information.
Step 3: Once the record is opened, select the Portal Contact Form and click on it.

Note: Portal Contact form will be automatically created in CRM once the Dynamics Portal installed successfully.
Step 4: Goto Web Authentication Tab to see the profile information of the portal user.

Hope this article helped you to check the Profile information of a portal user 🙂