I need to do a similar mail merge and feel terribly dense because I do not understand the tutorial that you directed this user (bh24524) to use. Could you help me?

I want to send end of the year giving statements to our donors and of course, each donor has given a different number of gifts. My spreadsheet has a donor ID # on each row with a fund, gift amount and fair market value for each gift. I would like to merge this with a letter for each donor detailing their gifts.