Access denied for user 'design_RM'@'localhost' to database 'design_RM'
The database server could be connected to (which means your username and password is okay) but the
design_RM database could not be selected.
design_RMhave permission to use the
username_design_RM. Could that be the problem?
If you do not know how to set up a database you should contact your host. If all else fails you may find help at the WordPress support forums.