i see people posting abt their new lgbt groups, do you have to be a member of blahaj zone to post here? is there an alternative where i can announce my future communities?

This community specifically is about blahaj.zone, so new communities here, but also server maintenance, bugs etc. It's not really the place to advertise new groups.

However, if they're queer groups and relevant to the community here, it'll be ok :)

That being said, there are groups for telling people about new groups, like [email protected] and [email protected]