Cant Login to Admin Account
Using Jamroom
On jamroom hosting, there is a button to do this (screenshot). Since you're not on jamroom hosting another way to do this is to create a new account, then change its 'user_group' to 'master' in whatever tool your hosting company gives you to adjust the database.
* open the database
* find the jr_jruser_item_key table
* locate the user you've just created
* set its 'user_group' to 'admin'
* save.
Login as that new user.