@SIrLordChris, a pleasure to hear from you. As for your question…
One does not simply… Beta Test. Well, I guess they actually do, but anyhow. When it comes to beta testing an official cog game that will soon e released, either Jasonstevenhill or dfabulich will make a post. It’ll have the name of the game with “Beta Testers Wanted” the instructions to test are at the top of the post. They’ll have an email there for you to send your request to. Your forum name, stating that you want to test, the game your testing for. Along with any other information that might be requested.
When it comes to general beta testing on the forum, if the game is in its final stages and in preparation of being submitted to cog, the author will most likely ask that you pm them to get a link that you can test.
Otherwise, general beta testing simply involves clicking on a W.I.P. reading what the author is looking for, clicking the link and playing the game then giving your feedback, posting errors or grammar mistakes you’ve noticed and the likes associated with beta testing. Hope this helps!