It's easy. They won't match up because I just remind the group that I'm adding. I have it set in my Sharebuilder account to buy on a regular basis. I did turn it off for about a month but it's back on. It won't match up exactly because I don't buy every time I post, I just buy regularly. I also don't post every time I buy. I don't think you'd leave anyway so why bother. If there were some way of insuring that, then I'd go to the trouble.
I did buy today, I think. I have to check to see if it went through.