How to configure my phpBB to use the server URL instead of my own domain name?First go to your cPanel and click on the phpMyAdmin link from the Databases box.
From the drop-down menu on the left choose the phpBB2 database. Once the page refreshes with the database contents, open the SQL tab at the top. In the text field write the following SQL query:
UPDATE phpbb_config SET server_name = "servername/~username" WHERE server_name = "domain.com";
You have to change "servername" with the server's hostname your account resides on and "username" with your username. The "domain.com" stands for the domain name the phpBB2 was initially installed with (generally it is your primary domain name).
Finally click the GO button to execute the query. If everything goes without errors, the phpBB2 database will be updated. Now you can access the phpBB2 with the temporary server URL and the forum to work properly with it.