1. First of all, in the beach version of famine, you need to sail in the sea to find kelp.

2. Secondly, kelp can't be collected directly. You need to put a trawl on the boat, and then control the boat to drive through kelp, and kelp will enter the trawl.

3. Finally, drive the boat to pull the trawl to the shallow sea area, put down the trawl, and then click the trawl to collect kelp, and plant the collected kelp directly in the sea.