At this time, Studio Helper only allows you to have one admin account.
However, if these users in the account are people you trust, you can share your username/password with them so they can login as the admin.
The system will allow you to have several people logged in with the same username/password at the same time. If you want to be able to create more than one admin, you can submit this idea on our feature request site at http://studiohelper.uservoice.com.
Please let us know if we can help you with anything else, at any time.