You need to tap on the "Insert code" button in the toolbar. Then it will show correctly:
[midi:PC62.0@3]
Seems like you are missing a space after midi:
. It should look like this:
[midi: PC62.0@3]
This command will be sent every time you load that song. If you want to play it at a certain time during playback you need to add a timecode to it:
[midi@00:15.0: PC62.0@3]