click "Channels" (you need to create an account first)
- Click [Add new entry], fill in:
- "Server" (exactly the same as in "Account"!)
- "Channels", e.g., #myCh1,#myCh2[ optional_chKey]
- leave "Auto-Connect" checked (for your favorite rooms)
- Optionally (for rooms visited only on demand) click [Add new entry]:
- "Server" (same as in "Account")
- "Channels", e.g., #myCh3,#myCh4[ optional_chKey]
- uncheck "Auto-Connect"
Repeat those steps for other servers/networks (there must be only one checked autoconnect line per server/network).
Finally click [Save changes]. and reload.
For allowing widgets to auto-connect, please see the corresponding page in the widget namespace.