It's harder to upload from a mobile device unless you already have an image that is hosted.

When you get to a desktop, do this:

First, transfer your image file from your mobile device to your computer.

Next...
- Click on the Settings near the upper right corner
- Click on My Photos
- Click on Choose File
- After your file has been chosen, click Upload Photo
- Your Photo should appear
- Right click on your photo and select copy image address
- Paste your image link into the message box, highlight it, and select the Image blue button on the left.

Your hosted image link will be in between the img tags and you should be all set.

That should do it!