You can add new users to the Profile Repository using the Community Administration Pages.
Log in to the Community Administration Pages.
Click the Community Users tab.
The Community Members page opens.
Click create user in the side navigation panel.
The Create New Portal User page opens. Enter the profile information for the new user. Note that fields marked with an asterisk are required properties. Click Done to create a new user profile. You can then use the Community Users tab to assign roles to this user.