no support done over messenger ^^
The steps you have to do are pretty simple:
Import SQL Dump
open DB in phpmyadmin or whatever tool you use to administer the db
select the users table, and change the membergroup id of the user you want to be admin to 6, where 6 being the admin group. As this is not your database, i am pretty sure you don´t have an user setup there, so good luck fecking around with the password for the admin account you trying to create
Seeing that this is not your own database, since you are not admin and dont know how to become one, i will not deliver any further support on this.