Pin tool not working! Help!

I have this app on my iPhone 6s and my MacBook Air and the pin works perfectly. I cant for the life of me get it to work on my iPad Air 2 . Please fix this. I really need the pins on the iPad since its more portable and a great size to use this app. Great app asides from that bug.

Phntm777 about Essential Skeleton 4, v4.2