Find the bell clapper in the secret room under the detention room, and repair the bell.
(see the related question)
Once you scare away the seagull from the bell tower, you can replace the missing clapper and ring the bell.(see related questions)
To get the seagull away, you have to turn the lighthouse light. Use the lobster.
No, you have to find a way to get the seagull to go away. As it happens, the lighthouse light can be turned to the left with a crank. Turning it will scare the seagull away and let you repair the bell. (see related question)
It is a lobster, not a crab. Use the lobster like pliers to turn the lighthouse light around. This will scare away the seagull on top of the school bell tower. (see related question)
Use the lobster to crank the lighthouse light. Turning it left will scare the seagull from the school's bell tower.
You cannot reach the bell tower on the school while the seagull is there. You will need to scare it away, and to do so, you can use the light from the lighthouse at Puffin Point. (see the related question)
Redirecting the lighthouse light will scare away the seagull, but you still need the missing clapper to fix the bell. You also still need the map to the Time Capsule. (see related questions)
Go up the lighthouse and there will be a little light thing. Use the lobster as pliers to turn it, so it will scare the seagull away from the bell. :]
get the lobster and the go to the top of the lighthouse and there is a light thing use the lobster and it would turn and chase away the seagull
They are talking on the playground and will not leave until the school bell rings. Unfortunately, the bell is missing its clapper. Find the clapper, and scare away the seagull atop the school. Then you can ring the bell. (see related questions)
You need the clapper, which is hidden in a secret room below the Detention Room of the school. You also have to scare away the seagull that keeps you away from the bell. Catch the photo floating near the lighthouse, swap it for diving gear at the photo shop, and recover the lost lobster trap for Cap'n Salty. The lobster can grip the lamp on the lighthouse to turn it, and the light will scare the seagull away. (see the related solution question)
The hidden room contains the bell clapper for the school bell in the tower. Get the clapper (hanging from the ceiling), and when you can scare away the seagull from the tower, you can fix the bell. (see related question)