Thanks for the nice comments–
You can look at any PGN by using the 'reply and quote' feature, or clicking the 'PGN' button below.
However in general the way to start a from a particular position (which sometimes takes a lot of trial and error, as the PGN viewer is finicky) is to use the 'SetUp' tag. See below a fragment from the blog which I've copied and pasted. The pgn tag goes before and after as usual, but the addition is that the [SetUp "1"] and [FEN "Whatever the FEN is"] are added. The moves then continue below. If having trouble, check the move numbers to make sure they line up. Also, the viewer only accepts the straight quotes, and the typeface I usually prepare the blog in had curly quotes before I modified it, so that tripped me up for a while. Best of luck!