Invited users and requests (pending and disapproved) in the "Requests" tab can be edited in the "Edit invitation" and "Edit pending/disapproved request" dialog. In the respective dialog, you can see details about invitations/requests and make changes as needed. As an administrator, you will find it easier to have an overview of all the settings directly in the dialog.
To edit:
Go to "Members" page and click on the "Requests" tab.
Click on the invitation/request. An "Edit" dialog
opens.

In the dialog, you can:
View user's details.
View and manage their user type. The minimal available user type is either "Consumer" or "Participant", depending on the active subscriptions in your organisation.
View and manage group membership via the "Add group members" option (possible for invited and pending approval status).
Imported groups are not shown as an option when adding members. For more info on imported groups, see "Imported groups considerations".
Click "Save" to apply any changes made.