You can use a lobster's claw to turn the lighthouse light.
Catch the old photo blowing in the wind by the left side of the lighthouse, and swap it for Scuba gear at the Say Cheese photo shop. Dive at Puffin Point to recover Cap'n Salty's lost lobster trap, and he will give you a lobster.
on top of the lighthouse
There is a lighthouse on Big Nate and Vampire Curse Island.
It needs to be dark
you use it to turn the light on the lighthouse
You will have to swim for it : the lighthouse is on Big Nate Island, not Counterfeit Island.
It is on top of the lighthouse.
aim the light from the lighthouse at the bird
The light house is next the next place after the playground. If you mean Big Nate Island.
It is not physically possible to go inside the Lighthouse on Big Nate in Poptroica.You don't. Everything is on the outside (comic at top, photo at bottom, light can be turned - see related question).
Use a lobster to grip the crank on the lighthouse light. (see related question)
To get the seagull away, you have to turn the lighthouse light. Use the lobster.
you use the lobster to pinch the lighthouse light and then it moves and the seagle moves!