Step by step

-- prepare --
1. get Sailaway III latest version
2. join the Offshore E-Sailing Yacht Club (you can read this only if you allready have )
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-- on August 31 11:00 UTC --
3. go to the boats,inventory , My Boats
4. in drop down select the Yacht Club
5. select J-Class boat you want to crew on
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If that boat is not registered for the race
1. Go to Events, select the J-Class Trophy race
2. Click register.
3. Register as yourself.
4. Click register
5 In the race window click sign in / to startline
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Sail the race.
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You want to crew on a boat?
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How to on Youtube

J-Class Trophy how to join crew
https://youtu.be/H0t5oeA03C4