Okay, so, I just started a Tumblr. Can someone please explain to me how it works/how to do it?
What exactly are you having trouble with?
You just start an account and then turn into a hyper-emotional fangirl who cries because she saw fan art that clashed with her otp. It really is that easy.
Make some posts. Follow people. Reblog things you find interesting. Look around in tags that match your interests. Also install missing e. It makes tumblr's interface bearable.