Here is a step by step ... hope it helps :)
1. You will need to sign up with photobucket or a similar service and then upload your computer images to photobucket (there is a green upload button on the PB toolbar). Once image has been uploaded to photobucket click on the blue bar to the bottom right of it which says Save and continue to album.
2. Once you have uploaded the image you wish to share on the forums hold your cursor over the image (in photobucket) and a set of option boxes will appear under it. Copy the info in the one which says Direct link.
3. Now when you open a new page you want to post on here in the forums you will see a little yellow mountain pic on the page toolbar. Left click on that and you will see a yellow bar toward the top of your screen asking you to allow scripted window. Right click on yellow bar and then left click on option which says ‘Temporarily allow scripted windows’.
4. Then click on mountain pic again and you will see a box appear on the left top of your screen.
5. Delete any info in the space bar in the box and then paste your info you copied form photobucket then click ok and your image should appear on the forum page.
OR
Right click on a picture from the internet and save it as a picture to your computer. Note where you have saved it and be sure that the file is not too large. I think 93kb is the max. I usually save pictures as .jpeg because they are the smallest.
Then when you compose a post, scroll down to where it says "manage attachments" and click on it and it will allow you to "browse" your computer where you can find and upload the picture you just saved there. Then hit submit and hopefully the picture will be there.