Hmm I did the same commands, but unfortunately I couldn't do it this time.

Only difference is:
In 52nd line I couldn't change the variable name to "SELECTDESTINATION", and had to leave it as "#3".
So in 58th line I used the value name as "#3". It compiled properly but didn't change the result.

Can you please tell me the other option to make the address read-only? Additionally, am I able to remove "Change..." button completely?