You must have 3 posts in the forums. So you need 1 more. Just respond to someones post and that will then give you access to send messages. Then follow this guideline to submit your game.
https://f95zone.to/threads/game-uploading-rules-2019-06-25.524/ Once you have done so, REPORT your game as specified. Then the moderators will look it over, and approve it.
To get developer status, send a message asking for it, and the mods will get back to you about it. They will need proof you are the developer, so an image of you working on the game is usually enough, though there are other ways to prove it.
Hope that helps