Process to add an existing channel with a security key?

[vkoser]

Sorry, but I can't figure out how to add a local channel we use when I already know the security key.
Is there a way to do this vs creating a new channel?

[ekollof]

You can join an existing channel from the same + dialog used to create one:

1. Pick a free slot (1–7)
2. Enter the channel name exactly as other radios use it (do not add a # prefix if you are supplying the key)
3. Paste the 16-byte secret as 32 hex characters (colons, spaces, dashes, or 0x are fine)
4. Click Create

A #name still means “derive the secret from the name” and ignores any key you type — that is how MeshCore works.

This is on master.