Can I add a pop-up sign up form?
Does it benefit your user?
Pop up forms can be an annoyance. You’re reading an article and suddenly your screen blurs and a big sign up form blocks the content.
“We’re nearing the point where websites have abused these elements so much that the problematic instances far outweigh the cases where popups remain a useful design tactic.”
If you are going to use one make sure you do it in the right way.