The highlighted bits of code are not really necessary for our purposes here, but if you choose not to edit them out it really won't make much of a difference. It will simply say "click here to enlarge" under each picture. The same function happens if you click on the picture itself so I don't understand why it is included. The [/CENTER] bit of code simply centers your picture in the allotted space. I like mine to stay to the left so I choose to edit that out. Besides it doesn't always work, depending on which forum you're on.
Anyways, it's that simple to "Use" this Image Hosting site. For Android users there doesn't seem to be any app, you just go to the same web page and the instructions are exactly the same. For iPhone users there is an app and you just follow the on screen prompt to upload. Just search for "Use.com" in the app store. It's free.
So once that's all done you just copy and paste right here in the text box. No extra steps to it.