It's very easy bro why do not you first read and explore before you make a thread like this, your question has been answered many times by many users here in the forum, I only advise you to avoid being lazy and train yourself to read first, I think you're lack of knowledge you are not ready yet to join a signature campaign. but I still answer your question, if you join the signature campaign you just need to fill it up like this,

btctalk name: (your name)
rank: jr member
count post: (how many post do you have)
btc address: (your wallet address)
Wear appropriate signature: "Yes" (then use their sig. code)
wear avatar: (if available, but your rank is a jr member so you can't wear an avatar yet you can put a "N/A" instead of "Yes")

take note you must read the campaign rules to avoid penalties.