Can’t select database

how to solve the problem.

We were able to connect to the database server (which means your username and password is okay) but not able to select the pekanpos_wp890 database.

Are you sure it exists?
Does the user pekanpos_wp890 have permission to use the pekanpos_wp890 database?
On some systems the name of your database is prefixed with your username, so it would be like username_pekanpos_wp890. Could that be the problem?
If you don’t 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.

Try again