You have Imageshack so copy the code for the forums under the section Embedded code. It's the first one at the top of the options for your image. But as Burden said, make sure there not huge so upload them at something like 800x600 or less.
1023 posts and you're asking about posting pics!!!
Only joshing you, good to see some nice pics from you. There is a sticky instruction in the Skybar on posting pics. You are using imageshack and you are already 90% there, you just need to copy the right link into the thread. Instead of the option "thumbnail" which you seem to be using, try "hotlink for forums", copy and paste, and Bobs your Uncle.
PS - 1024x768 (17 inch monitor) seems a good standard size.
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