Pretty much everywhere..
To get your bot in a different channel you need to join that channel using the /join command (which might be handled by /server in an on start event, but that's still sending /join to the server at some points).
Joining a different channel is as simple as typing /join #channel.
The problem is that your script does not handle multiple channels. You could be adding more than one channel for the location of your events (like on *:text:*:#channle1,#channel2:{ ), it wouldn't work anyway, because the script does not care about the channel, it's not taken into account, you need to take it into account and create dynamic name instead of static name.
You can read more about creating dynamic name
here but you should really look at Loki's second quote in his last post on that link he gave. It's exactly what you are looking for, your static section's name ("commands") for the INI file was changed to a dynamic name: $chan (or #, which is the same, but I recommend using $chan instead)
