Here’s how the app works:
1) Open Screen Recorder HD
2) Tap Settings and set the orientation according to what you will record
3) Tap Record and tap Start button
4) Press Home button and open anything you want
5) After finishing your work, open Screen Recorder and tap Stop button
6) Wait for encoding, then tap Videos
7) You will see your video there. Tap blue indicator on video and save it to Camera roll.