I'm trying to play the Neil Young song Hangin' on a Limb. Here's the URL http://www.ultimate-guitar.com/tabs/n/neil_young/hangin_on_a_limb_crd.htm

I'm having trouble figuring out the D6 chord, and it states to begin on the 7th fret? What do they mean by that?

Either way I can't get it to sound right. The first two chords are perfect but the rest I can't seem to get right. Also this is the ONLY tab for this song online that I can find. I've been on numerous websites and always found this same exact one.