Ralph blows the conch/shell to call an assembly. The sound of the shell in the beginning of the book ( Chapter 1), brings all the other boys out of the forest.
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You make a conch shell produce sound by vibrating your lips on one end of it, the concept is one similar to that of using a trumpet or french horn.
they apparate together if that's what you mean.
Ralph finds a conch shell in the lagoon and retrives it with the aid of a sapling. When he manages to blow it he makes a loud 'booming' sound which atracts the attention of the other boys on the island and draws them to his location.
The importance of Chapter 1's title is that the sound of the conch shell brings all the boys to the same spot
In chapter 1, they find a conch shell and piggy relizes that the conch could be used as a horn to call all the other boys on the island. With that, they blow into the conch and many boys come to the beach.