RE: Get FREE Byteballs today just for having a Steem account! $10-80 in free coins!!

First part to your comment is, yes – bot will show you a Byteball address. That's where you have to send your byte to.

As for the minimum amount, you can ask around from other users or alternatively you can Google. I'm also not very sure about that.

EDIT: My first exchange was successful when I sent 190,000,000 bytes but second exchange when I sent 23,000,000 bytes it was considered too small. So I got nothing for the second exchange.