Hey! Great to hear that you’re wanting to introduce yourself! The forum operates on a trust level system. Your level allows you to access different areas of the forum, opening up as you spend more time interacting. It’s just our way of making sure you don’t have to jump straight in at the deep end not knowing what’s going on.
To access the Guilds threads, you need to be trust level 1. Stick around, do some more reading, and you’ll be notifed when you can access them 
If you’d like a better explanation, one can be found in the Forum Primer.