lock screen go sms pro

[Flashheatmvp3]

Looking for a way to see and maybe even reply to the text through the lock screen, like a pop up window. However I want it to just be on the lock screen not pop up when i'm in other apps, then I just want it on the notification bar. Using go sms pro and would like to keep it like that, but not opposed to downloading a free lock screen app that would let me do this