I've never used Photobucket before but here's how I would do it...
1. Go to your pictures on Photobucket.
2. Find the picture that you want to post here.
3. Place your pointer over the picture and then click the right mouse button.
4. A menu will pop up, select "Properties."
5. Halfway down the Properties window you will see "Address: (URL),"
6. Place your pointer just before the first "H" in http and press and hold down the left mouse button and drag the highlight box all the way past the last letter in the series of letters.
7. Release the right mouse button.
8. Place the pointer over the middle of the highlighted text and press the right mouse button to bring up the menu again.
9. Select "Copy" from the menu.
Now back at CorvetteActionCenter.com...
1. Click "Reply" to one of the messages.
2. Click on the "Insert Picture" icon; it looks like a picture of a mountain with the sun in the upper right hand corner.
3. In the "Script Prompt:" window you will see "http://" highlighted, place the pointer over the middle of these words and press the right mouse button.
4. A menu will popup and you select "Paste"
5. Click on the "OK" button to close the "Script Prompt:" window.
6. You should now see your picture with in the Reply.
I how this helps.