There may be occasions when you need to give someone more access in your organization, and other times when you need to give them less.
Upgrading a Guest (External) to a Guest (Internal) gives them more access, and a Member gives them yet more access.
To switch a Guest (External) to a Guest (Internal), or a Member to an Admin, or to change user permissions in general, you first need to be in your organization manager area, which is only accessible to admins.
Once there, click the existing user type and you’ll be shown a list of the other user types available. Select the one you’d like to move to and it changes the user type.