The mod requires some pretty decent knowledge of computers and good at following directions. It will remove the OUYA menu and you will be left with normal android OS and home screen at a version which I think is KitKat 4.4 and you will be able to install the latest version of Kodi.
If you don't...
Need more detail or a log
Your best to delete Userdata and start fresh.
I believe you can only run Kodi version 14.2 and lower since 16.1 requires a higher android OS version unless you cyanogenmod it.
Make sure you are installing version 14.2, once installed before loading any other addons...
More than likely since that app was purchased under your account it won't show up on his.
Use Firestarter instead, I have mine set so when I double click the home button it starts KODI, single click takes me to Fire TV home
The problem with OUYA is the android OS is too old and they did not upgrade it, I believe its around 4.1 which will only run up to KODI version 14.2, Kodi 15.0 and above will only work on android OS 4.2 and above.
The only work around is to do the Cyanogenmod which blows the OUYA software away...
If you know how to SFTP and SSH into the Apple you can navigate to the Kodi folder then to userdata and edit the guisettings.xml
Exit Kodi first
This should work but not 100% guaranteed, if it doesn't then use option 2
You can do a replace all skin.blackglassnova with skin.confluence
Go to the Pivos Forums and grab the latest TOFU Linux on XIOS DS, I have to say it is the best release to date for the DS and it is supported by Pivos Group which I believe they have hired on Hydra to start coding official Pivos releases like this one.
PM me if you need more info