Are you looking to upload them from photobucket to here or from your computer to photobucket??
If from photbucket to your post here then you can hover the mouse over the photo and click on the IMG Code which is at the bottom of the list and then paste it to your post here
If you find a photo from a different website you want to post on the site, right click on it and select properties, then copy the link that ends in .jpg:
Then click the little image icon in the post reply screen to get the IMG tags:
Then paste the link to the photo inside the IMG tags:
If uploading a pic that is saved on your computer, just click additional options in the post reply screen and browse to where it is saved: