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You should not have any difficulties adding another E-Signature widget.
What I would suggest is to use any standards compliant browser, my personal recommendation is FireFox, but Chrome, Maxthon will be OK as well - just not Internet Explorer.
Using any of them would allow you to add another E-Signature.
I would however suggest taking a look here to see how to add a widget to your Form
Do let us know how it goes.