You can install PEAR in your account for yourself only. I've done it before and you can manage yourself the packages you want. I'll go get more info and post back.
On the PEAR website ( http://pear.php.net/manual/en/installation.shared.php#installation.shared.ftp ) you have two options. The new...
Are you using your cPanel authentification for the FTP? Make sure you are using the information provided in the cPanel FTP manager: http:/starka.x10hosting.com:2082/frontend/x3/ftp/configure.html?acct=lifeorde&type=main
After the login success page, try to browse directly to http://stoli.x10hosting.com:2082/frontend/x3/index.php by copy-pasting the address in your browser.
I personally recommend doing a manual install for the added flexibility, but some people prefer using softaculous since there is way less user interaction.
At least, you solved your problem!
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Actually, SourceBans is just a server management utility. It's a php application that concentrate in one location many settings for source-powered game servers such as admins, bans, etc.
Go in phpmyadmin and browse to the database that was created for phpbb. check for the members table and make sure that the username you are using is in there. Be careful not to edit any of the data present in the database as it could become corrupt.
This is usually not a problem, but since I don't know if the code you presented is the complete page, make sure that session_start(); is the first thing that appears in your php page. Each page that uses the session information should start by :<?php
session_start();
?>