Capturing Signature on Mobile

Hi, I'm just getting started with Zoho CRM plus. I need to capture signatures on my iPad. I'm wondering if zoho can do this and if so, how? There is so much to learn, I don't know where to do this; zoho docs? zoho creator? invoices? quotes? I'm looking into the echo sign or right signature apps. Can anyone save me the research and tell me how to set it up so that I can close a deal on the spot and get a contract signed on my iPad?