Help please!

So it was working fine and then I realized I had to paste it and I have no idea how to do that can I please help me I am so confused I really like the app but I might have to delete it if I cant figure out how to paste and that would be a shame as for it is a really great app otherwise and definitely recommend for if your bored or if you are looking for a little customization to your texts again PLEASE HELP!!!

Starry gymnast about Color Text Messages+ Customize Keyboard Free Now, v2.6