I need to change from a sub user to the main account

How do I change to the administrator of my account?

Form are simply shared from one account to another when an account is added as a sub-user.  There is no way to change roles.  If you would like, at the request of the users that has the forms, we can move the forms to your account.  Have them log in to their account and create a new request letting us know they would like their forms moved and the username of your account. 

Other than that, you would simply need access to the account that has the forms and has shared them with if you would like to manage the forms.