Using Digital Signature

[rmullins@diamondhealth.com 0]

I'm new to Nitro and need a simple 1-2-3 on using the digital signature.  I'm using it to send letters for the recipient to be able to digitally sign online and send back.  I have placed the signature block in the appropriate place.  is that all I need to go before selecting Request Signature.  when the recipient receives the email, what is he seeing and what does he need to do to sign and return to me?

Thank you