I assume you saw https://www.magiclantern.fm/forum/index.php?topic=17969.msg233693#msg233693 ?
Not sure if you are doing it incorrectly or it doesn't work on your model for some reason.
Also, It may eventually be ported to version 1.2.0.
(https://bitbucket.org/ccritix/magic-lantern-git/src/0dc9b73b37356575460576525de2ca2f8e3e0900/platform/1300D.120/?at=branches%2F1300D?)
Not sure if you are doing it incorrectly or it doesn't work on your model for some reason.
Also, It may eventually be ported to version 1.2.0.
(https://bitbucket.org/ccritix/magic-lantern-git/src/0dc9b73b37356575460576525de2ca2f8e3e0900/platform/1300D.120/?at=branches%2F1300D?)