This is all pretty much self explanatory. But heres a brief run down..
Select the root note, chord flavor (Major, Min, Sus, etc) etc
Guitar pro will show you a chord diagram for the chord on the RHS, as well as a list of alternate ways of playing and alternate names for the chord.....
You can also click the frets on the Chord Diagram, and build your own chords (clicking above the "nut line" will change the string from open to muted if there are no fretted notes on that string)