How can I increase my trust level on the forum?

Although the forum software has a trust level feature, we don't use it for anything, apart from trust level 0 for new users to avoid spammers by moderating all posts. To get to level 1, you have to read five posts in two topics, and spend 15 minutes reading posts. So you'll probably do that in your first day on the forum. Beyond that, don't worry about trust levels.