Here you go......
From an iPad, when using the Photobucket for iPad app.......
When you find an image on the interweb etc (or take a photo), save it into Photos on your iPad.
Open the Photobucket app, click on the arrow (top right hand side of screen), click Photo Library, click Camera Roll.
Click on the image(s) you wish to download and once downloaded click on My Albums (bottom of the screen) and your image is there, ready to upload into your post.
Click on the image you wish to place in your post, click on the Link symbol (second from the left on the top right hand side of the screen) , click on the IMG Code link, tap OK when it says Copied To Clipboard.
Now in your post, tap the screen (within the writing box) and press Paste from the options.
Done.