Posting pictures
If I may add, the yellow upload photo button is all the way at the bottom of the page of the thread that you are trying to load the picture to. Hit the upload photo button.
Now, the picture has to be on the device that you want to upload from. If it's a picture you took with your phone camera it should be in the gallery of your phone. You may have to hit documents and then photo gallery or something like that.
Tap the picture. Then like magic it should be attached to your reply. You can also hit another button and make it a full size image in the reply. Hope I have helped and not confused the issue.
See, easy!