HP50G help library of trig identities

jhox08

I would like to create a library of trig identities but honestly don't know how, I tried reading the manual but that didn't really help....I found a program Treebrowserbuilder that looks very user friendly but the only site I've found it on either doesn't allow it to be downloaded or I have been over looking it, can anyone tell me how create a library or tell me how to get treebrowserbuilder.....thanks