It's simple mate. Have you got Google play? Type in photo uploader and an app called photo uploader imgur should be there.
Download it, open the app and you should see a green circle with a plus sign in it. Press it and your gallery and other icons should appear. Choose photo, it downloads it then you save it to clipboard. Then when you come to putting a post on here there is the icons above, press on the 6th icon from the right, that should then show you a box where you stick the url, saved in your clipboard remember, insert that and you should see the image displayed.
Simples yeah ha ha.