Help on Chord track and other issue

HI…just getting started with cubase 7…love it and the possiblities I c with it. Trying to learn the chord track…I can do a 4 bar measure ok…but if i want to add more chords after hearing what i done…how do I add the chords new bars into chord track. I have watched the video read the online manual…guess it aint sinking in as quick as I would like…wish there was a printed manual on cubase 7…got to wait til october when one should be coming out…also how would i beable to do say a DaddG chord?..using IMAC 2.9 mountain lion 10.8.3