Add the "I need to sign" function

I use Acrobat X Pro.  When I click the "Sign"  Button I do not get the  I Need to Sign, Fill & Sign, Place Signature  Menu Options like I do using another computer in Acrobat Reader XI.  Why?  Or, alternatively how do I activate those convenient options in Pro?  When I click on the "Sign"  Button in Pro, I get "Sign With Certificate" Options...but nothing that would allow me to simply place graphic signature file like in Reader.