Location in JpegJet: Setup Menu -> Newsgroups Start
Each post on a Usenet server is assigned a number when it arrives. JpegJet scans newsgroups using this number. It goes from lowest to highest. If you want JpegJet to start over at the beginning of the newsgroup, click the Last Post Downloaded number, and change it to zero.
If you want to skip forward, add the desired number to Last Post Downloaded. So, if the Last Post Downloaded was 1000 and you wanted to skip a post, you would make it 1001.
Post numbers are different from server to server. So, if you have more than one server, you will need to adjust each.