Open up a Photobucket account. It's free. Then you down load your pics to Photobucket. They automaticallly get resized to fit onto the forum. Then you just to hightlight one of th URL addresses for each pic and then copy and paste into the thread. Unfortunately, there are like four different addresses for each pic that you can chose from. I'll get the specific one you want to highlight tonight when I get home because we're blocked from Photobucket at work so I can't access it. I'll post the specifics tonight for you.
It's easy and I have noticed that most here post the Thumbnails. Drives me a bit crazy but it's certainly an option. I prefer to have the full size pic post into the thread. It's much easier fro everyone to view that way IMHO.
When you get the photos downloaded to photobucket, the pic that you download will have options underneath the pic. Click on SHARE under the pic and it opens up another window that gives you options to share with facebook, twitter etc. At the top of that window is a tab labeled "Get Link Code". Click on that. It gives you 4 options. Some of the options have a two additional options (for thumbnail or full size). Click on the fullsize (vs. thumbnail) box labeled "IMG for bulletin boards and forums" and then click SAVE. Once you do this ALL the pics in your photobucket album are labeled with the IMG code for fullsize downloads to forums and bulletin boards.
Now all you have to do when you want to post a pic to a thread is click on that IMG code under the pic you want to post to highlight it. Then you you right click on that highlighted code and click "COPY". Then go back to the thread and right click where you want to insert it and then click "PASTE". The IMG code is pasted into the thread and when you preview it, the fullsize pic is in full view.
I know that it sounds like a lot to do, but once you get all the IMG codes on all of the pics in your album, each time time you post a pic is really easy. Open up a seperate window for Photobucket and one for the forum and you just copy and paste from one to the other. It's repetition for each pic. Once you do it a couple times you'll find it's very easy.
Hope this helps out.