Do you mean profile or just photos in the relpy box? I use photobucket for photos. Just press the image button in the reply box and paste in the URL for it.
For profile photos its the same, Just edit your porfile and add a photo.
I use my iPhone to post pictures using photobucket so it won't be because your using an iPad. All I do is upload the pics I want to the photobucket app on my iPhone, then go onto the pic on the app, click the "I" button in the bottom right of the screen, keep ur finger on the "img code" until it says img code copied, then just paste it on here. It will come up as a pic rather than the link