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My Profiles - these are the profiles of your account.
Shared access - the profiles that you have been given access to.

To access the profiles from "My Profiles" you will need to sign in with the desired account. When you sign in with "Shared access" you sign in with your own account (the one you've been given access to) and then switch to the account you want (the one you've been given access to).

To set up other people's accounts, it's preferable to use "Shared Access".