I posted one this morning - so I know that a Bear of Very Little Brain can manage it. Have you got Microsoft Office Picture Manager? or something like that that you look at your photos with? You just have to open your picture in that, and then go to > Picture > Resize. Then alter the size with the options that come up on the right, and resave it somewhere else as a different name. Then when you upload it to TMA, press 'browse' and find the place where the file is on your own computer. Sorted. Hopefully.

Or am I missing the point, Bob? Do you mean what do you do to post the image? If the site's already on TMA, just go to that site's page, and before you get down to all the photos and the notes, there's a little pull down menu on the right hand side that says 'Add'. You pull that down and pick 'add an image', then it'll take you to the page where you add all the details. If you've been to a 'new' site that's not on the website yet, it's more complicated.