This app was mentioned in 2 comments, with an average of 1.00 upvote
I couldn't get mine to work either, I went with the mcma app instead.
https://play.google.com/store/apps/details?id=com.cubecoders.mcma&hl=en
https://itunes.apple.com/us/app/mcmyadmin-mobile-for-minecraft/id469794253?mt=8
https://www.mcmyadmin.com/#/home
https://play.google.com/store/apps/details?id=com.cubecoders.mcma&hl=en_US
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Mymcadmin is free to use, but the mobile app is $2.99