Answer:
Now, just after sundown, when all his work was over and he was on his way to his berth, it occurred to him that he should like an apple. He ran on deck. The watch was all forward looking out for the island. The man at the helm was watching the luff of the sail and whistling away gently to himself, and that was the only sound excepting the swish of the sea against the bows and around the sides of the ship.
Step-by-step explanation:
To change first person to third person, simply change all words such as "I" or "My" to a pronoun like "he" or "his". In my answer I assumed the first person view was from a male perspective - you may need to change it to female or neutral pronouns to fit your needs.
I hope this helps :)