Hi Rama,
If you want to implement AAM and need admin rights for AAM. Then, you can add an admin to AAM UI from Enterprise Dashboard :
http://adminconsole.adobe.com/enterprise this console is for user access management for all Experience Cloud products.
Also, if you want an API user as admin on AAM UI which is not linked to Experience Cloud log in, then you can contact AAM client care to request this type of user.
Thanks,
Varun Kalra