I can't create mybb forum

Hosting Support
1

I can’t create mybb forum. Because i can’t database username.It says ‘‘Premium hosting MySQL server benefits’’. Please help me ?

2

Okay I solved.I changed ‘‘Database Server Hostname’’

3

The database server hostname is not localhost, it should be something like sql123.rf.gd. The database username should also be just rfgd_12345678 without the database name suffix.