Can’t select database
We were able to connect to the database server (which means your username and password is okay) but not able to select the my_rinia database.
Are you sure it exists?
Does the user rinia have permission to use the my_rinia database?
On some systems the name of your database is prefixed with your username, so it would be like username_my_rinia. Could that be the problem?
If you don't know how to setup a database you should contact your host. If all else fails you may find help at the WordPress Support Forums.