Database not loading after transfer via phpmyadmin

In order for WP to pick up on the custom table prefix you need to set it in wp-config.php.

Locate this section:

/**
 * WordPress database table prefix.
 *
 * You can have multiple installations in one database if you give each
 * a unique prefix. Only numbers, letters, and underscores please!
 */
$table_prefix = 'wp_';

and change the wp_ to tm_.