What exactly do you think you are going to help them with? The original post, which they have now deleted, said the following:
"I know the standard tip is 18% but my husband and I really struggle with this."
They then went on to ask:
"Is tipping a flat rate of $10 per meal insulting?"
The only answer to this question is "YES", and they have already been given this answer by multiple people on here, after which, since it is not the answer they wanted, they decided to change the name of this thread to "DELETE" and take their toys and go home.
I bet they still aren't going to tip, though.