If you are new to Foldit, here are detailed instructions to get you started:
http://fold.it/portal/node/988864
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If you want to fold proteins, know that there are many ways to play and this variety is the main value of Foldit:

- try all puzzles not only "beginner" ones,
- fold first the ones you like the most,
- try by yourself to understand what works and what doesn't,
- ask for tips in global when you think you doesn't understand something.

Make sure you have followed these tutorials:
- lonely sheets,
- lock and lower,
- rebuild,
- structure and rebuild,
- control over clashing

before starting this puzzle.
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Original Puzzle:
http://fold.it/portal/node/321834