How to upload photos using Photobucket:

This is your main Library screen inside of Photobucket. Click the upload button (circled in red)

Click on "Choose photos & Videos"

Select one or more photos by clicking on them, or hold Ctrl and select multiple shots to upload

Once it has finished uploading them, you select "view uploads" (circled in red)

Once you are viewing your uploads, select the photo you wish to upload to the forum. In this case, a spotfin mojarra. Click on it.

Once you are in the lightview screen, you simply click on the IMG code that was generated (circled in red)

I created a fake thread on Simply to demonstrate where you can paste it

Enjoy your linked photo