How do I dismiss a pop up on my phone?

[AC Question]

how do i dismiss a pop up on my phone

I am having problems with my phone it keeps restarting and won't come on and when it does come on a pop up shows up and will not go away what do I do

 

[B. Diddy]

Re: how do i dismiss a pop up on my phone

Welcome to Android Central! Which phone? What does the popup say? Is it a system message or a popup ad?