You could always download the Photobucket App if you have a phone that allows it and then save your photo to that App.
Then, go to the Photobucket photo you want to share and click on it and you'll see a button on the bottom left (like an i in a circle), click on that and it will give you the links to post photos, click on the "Direct" option and the link will be saved.
Then, post it onto the forum by clicking on the image button above and pasting your link inside the IMG brackets.
Hope that helps.