Help? – Flow: Sketch, Draw, Take Notes Review

Alright so, I think the app is pretty nice, I haven’t been able to make it work though. Every time I try to draw, it gives me a page of something like, “Would you like to go membership”. And so, I can’t draw, is there a way to fix? I don’t know where else to go for this question, sorry.
Review by vivien0415 on Flow: Sketch, Draw, Take Notes.