They can use their finger on their smart phone or touch screen, but there's an option to just type in their name -- or so clients tell me. I myself cannot pass the verification (ex used this address for a long time, so no matter how many times I work with the credit bureaus, I still have things from his second marriage creep back in, get questions like what street did you live on in Syracuse or who was your mortgage holder on your current house or which number is your Brooks Bros account? that have nothing to do with me!!) so haven't been able to get all the way to the signing to test it myself. I'd hoped to have a client eSign in my office so I could watch the process from a client's perspective, but I had NO clients in my home office this year.
I haven't had anyone "fail" eSign due to not being able to sign. I've had young kids without much of an electronic footprint out there who couldn't pass. (All my college-kid clients pass.) Because NY wouldn't accept any type of electronic signature until they tested it a bit this year (and finally voted it in) and I have NY residents and a lot of NY commuters, I haven't used eSign a lot until this year and not for all of this season. This is my third year with it. But now that NY allows electronic signatures, I try it first with all personal returns. (I don't think biz returns are eligible.) I think it's three out of four questions to "pass," but I've had clients who "fail" (usually a question way in their past) a couple times over my three years, and I just resend and they "pass" the second time.
The resulting signature box is really teeny, tiny, but there's also a box that verifies it was eSigned with date/time.
I'm going to ask around about the touch screen issue.