Furries are typically nonsexual. It's more often than not just roleplay for autistics.

Source, autistic furry who doesn't want to fuck in the extremely expensive fursuit

It's a one question quiz, actually:

Do you want to be a furry? Yes or no?

If yes, congrats! You're now a furry.

I'm actually an asexual furry. So no, you don't have to engage in any sex at all. I like the aesthetic and I've met a bunch of my friends through the fandom as a shared point of commonality.

Probably the biggest question you'll get asked as a new furry is "what is your fursona?" If you say you don't have one, everyone will make a pitch to try to sell you on theirs. (psst Maned wolves are cool.)

For a more in depth explanation, take a look at furscience. They're an actual research institution studying the fandom.

I'm guessing people would be weirded out if they knew you weren't actually furry-inclined, so it's probably more down to being a good actor, if you're just there to network. And then basic networking skills, after that.

For the real Furry Certificate, you need long socks and to install and use specifically Arch Linux.