To post in the LGBTQIA club, when you are selecting a category, click "Clubs" and it will bring up another thing you can choose from, scroll there until you find LGBTQIA Club. There is a post on a bunch of definitions of all that but for the main 5, LGBTQ+-
Lesbian- This is girl x girl, which is what I am.
Gay- This is boy x boy.
Bisexual- This is where a person like both genders, male and female.
Trans- Where someone goes from one gender to the other.
Queer/Questioning- Queer is an umbrella term that applies to all sexualities like homosexual, bisexual, pansexual, ect (you can view a lot of them in the linked post). Questioning is when someone is figuring out what they are.