1. The first step is to open the window of your email or AP/PP receipt that you want to take a screenshot of.
2. Just to the right of your keyboard, you should see three groups of keys. The lower set of keys usually is a group of arrow keys. Above that is usually a set of some six keys that are labeled "Insert," "Home," "Page Up," etc. Above that should be three keys that have rather odd labels - like Pause/Break and ScrLk. One of those keys should be labeled PrtScrn/SysRq. This is the key, press it:

3. Open MS-Paint or similiar program. Create a new empty image, and use Edit/Paste to bring in the screenshot you just took.
4. Save your screenshot in JPG file format.
5. Upload your screenshot to your latest processed payment in your Payout Request page here.