Some people have had a problem staying logged in or using Photopost, which was due to an address issue.
You should be logging in using the URL address:
http://www.thedieselpageforums.com/tdpforum
Using the numeric IP address doesn't keep you logged in.
i.e.
http://72.22.76.69/tdpforum
Resizing images..... You'll need an image program. I don't use the programs included with Windows - they might have that capability - I don;t know. I use a variety of image programs (Photoshop, Paint Shop Pro, Publisher Pro Photo Editor, etc.)