Log into your web host control panel, look for phpMyAdmin (will either be an icon or could be listed under Databases) and then follow the WordPress database restore steps below.
http://codex.wordpress.org/Restoring_Your_Database_From_Backup
Restore Process
Using phpMyAdmin, follow the steps below to restore a MySQL database.
- Login to phpMyAdmin.
- Click “Databases” and select the database that you will be importing your data into.
- You will then see either a list of tables already inside that database or a screen that says no tables exist. This depends on your setup.
- Across the top of the screen will be a row of tabs. Click the Import tab.
- On the next screen will be a location of text file box, and next to that a button named Browse.
- Click Browse. Locate the backup file stored on your computer.
- Make sure SQL is selected in the Format drop-down menu.
- Click the Go button.
Now grab a coffee. This bit takes a while. Eventually you will see a success screen.