Entry message
An entry message can be set, that is shown to every user upon joining your channel. They see, for example:
Welcome to YourChannel, please feel free to ask your question about Green Tree Frogs.
Entry Messages for a channel can be set with the following command, for example:
/cs set #TheChannel entrymsg Welcome to YourChannel, please feel free to ask your question about Green Tree Frogs.
For help use:
/cs help set entrymsg