i'm in your conscience
There's a place for your friend code in your profile. Click "User CP" at the top of the forum then "Edit your details" and you can put that in your profile for people to use. You could also put it in your signature. And if you want to battle, I think there's a Quick Battle thread in Battle Center, and likewise for Trade Corner if you want to trade. Just having a bunch of random FCs isn't gonna help you much, unless you want to battle or trade, so yeah.