Hello. I'm not sure how to start because I've honestly never actually joined a forum before so this is my first! I'm a big fan of modding, especially when it comes to Bethesda games and I came here because I heard it had great hidden mods you can't find anywhere else and a friendly community. I'm looking forward to becoming a part of the community and I hope I can contribute something good! If anyone has any advice I'd appreciate it, because I'm not 100% sure how to contribute to a forum. Thanks again!

(Also how do I upvote people, like modders and such?)

Welcome to the GUN community. I'm glad that this would be your first forum to join. The GUN community is a very friendly place. 

https://www.gunetwork.org/faq

Read the faq if you are curious about anything especially since you said you wanted the hidden mods, the faq will get you there.
Now enjoy your stay and as long as you aren't a jerk and are nice to people you will get accustom pretty quickly. Again, Welcome.

Welcome to GUNetwork @zirr0m , regarding mod access and the sites rules, you might want to check out those topics too :
Rules and Guidelines
How to get mod access

Like @craigross93 said, respect the rules, be a decent human being, be nice and friendly and you'll do fine. I wish you a great time here, have fun, Take care

Hey zirr0m. Welcome to the community. Hope you enjoy the group here. It's a pretty cool bunch.

Hey @zirr0m ! Welcome to the community and hope you will enjoy your stay. If you have some questions don't hesitate to ask and please also check the F.A.Q. section to learn more about the rules, the mod acces and the community. Hope you will enjoy it and stay active.

Peace.

Welcome to GUN zirr0m! I hope your time here is going tibia blast . Have a good one.

Welcome to the community, trust me, you get accustomed here very quickly as the people here are very friendly and love to talk.