If you have a site its a good idea, esp when you first get it to check to see what the admin accounts are. This thread will show you how to find them.
First you will want to go to the admins member mangers by hitting the link shown below:

Now you will want to do a search of all members for permission 7 accesses as show below:

This will give you a list of all accounts that have permission 7 or admin access. And from there you can verify that they are your account/accounts or not.
This is very important when you first buy a site to ensure that the old owner did not leave any unknown admin accounts in the site.