Really Ratmick? That seems the hard way mate.. I use the photobucket app and its a dream, except it doesnt work in horizontal mode.. Haha
My method is download and log in to the app, upload your media, select it and hit the I in a circle at the bottom left, select the link beside 'IMG' and it copies it, then go to your web browser and write your post and then select paste, and away you go..