Yup, left that part out, sorry. When using that binding string, you are telling it to begin chat with the string everytime you hit enter. This makes no difference what chat channel you are in. For example, if done correctly, when you hit enter, this will appear in the chat line.
You are in the local channel.
Hit the enter button.
You will now see this in the chat line.
Local:<color blue><bgcolor black><border silver>
Then type your message as normal after you see the string in the chat and hit enter when done.
Hope this helps