Signature box that can be signed w/stylus from a tablet...

When creating PDF's I am having a difficult time setting up a signature box that people are able to sign with a stylist from a tablet, like an Ipad.

I am able to sign these pdfs with my own information just fine - what I am trying to have setup is to take an Adobe pdf document out to a client, and have a client sign a signature field with a stylus on my tablet. Using my tablet, I cant seem to get this to work. I only have the option to sign my own name