Here's the manual. I don't know how to do it personally. http://www.ask-tsc.com/pdf/KX-T76xx.pdf
Also have you considered setting up a google voice number? It's free and has numerous cool functions, like call forwarding, like you want to do with this phone.
https://accounts.google.com/ServiceLogin?service=grandcentral&passive=1209600&continue=https%3A%2F%2Fwww.google.com%2Fvoice&followup=https%3A%2F%2Fwww.google.com%2Fvoice<mpl=open#identifier
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