Rp Tutorials

Hello! I'm not sure where to ask this, so I hope it's alright to ask here. Can anyone point me in the direction of an email app for Android that will allow replying to comments through the app? I have the Samsung Galaxy S5 and the stock app used to work until an update or something months ago and now it will allow the cursor in the fields, but the keyboard doesn't come up for me to actually type in it. I've tried the GMail app with no luck and I found Aqua Mail and I guess an update took the ability away from that too. I'm kind of clueless when it comes to this stuff, so any help would be greatly appreciated!