There is no such thing as a community menu, I don't know what you mean.
With basic HTML.
If you go to Tumblr's home page, it has a form for you to fill out to make an account with Tumblr.
If you want to tag someone in something on Tumblr you have to type @, and then start typing their URL, their URL will appear above (or below) in like a drop down menu, when you see their URL click on them and it will make a link that tags them in it and they will get notified that you tagged them.
You can use the Whisper App to make facts on Tumblr.
Hit 'Play Now' and then hit 'Home' and you will arrive at the Community Menu.
Sign up for a new account make one and get on Tumblr.
with a camera.
Alt + 3
You make it up.
Good usernames for Tumblr should be unique and creative. Make a username that is an expression of who you are and your personality.
go on tumblr
With javascript.