I read it was easy to edit sound effects and music. But how can i do this? They are in .ogg file formats.
You may use an audio editor such as Audacity:http://audacity.sourceforge.net/
Less importantly how would i go about editing colour aspects of the game. I find the colours and highlited items hard to see lol.
You can easily change many things, e.g. players' sprites, menu backgrounds, etc.
But some aspects (e.g. colour of menu buttons), require you to edit source code.
In other words, you need the Blitzmax compiler and programming skills.