No exit? – Wild Runner Adventure Review

when I transfer stars I get them, of course. There's a problem with the pop up box. I want to close it but I can't. It doesn't have a "x" on it . It's just white and stays there even if I close the app. Same problem with buying items. How do I confirm? I use an IPad first generation . Help? ;(
Review by cnblue1999 on Wild Runner Adventure.