New to Steemit

HI everyone! I just signed up for my account and I have some question here. First of all, I was logged in for the whole time but when I clicked into one article, it ask me sign up again, and as well as when I am trying to comment it ask me to sign up.

It would be nice if you can share with me your trading experience like which site are you using for trading and what coin you think it has potential to boost in late 2018 since I'm new to the things about Cryptocurrency . Thanks a lot!