Can I use SDL online or not?

Studio newbie using trial 2017

After finding that I could use online machine translation with Studio, when I sent to set up a translation memory it appears the SDL Online machine translation is one of the choices:

After I set up a trial account with SDL online, I then tried to attach it to a test document and was told I could NOT use it:

Which is it? 

Can I use it?

Or can't I use it?

If I can use it, how to I attach it to Studio?