To make a fresh start-
1) From Finder pull down the Go menu and select Go To Folder.
2) Paste this into the text box and press Return:
Code:
~/Library/Application Support
3) Move the folder named Kodi to another location, as well as the folder named XBMC (if present). You can just put it on your desktop or something, but I think it's a good idea not to delete it until your sure you don't need anything from it.
4) Launch Kodi.app. It should launch with no customizations. All your addons, user settings and your library database will be reset when you move the Kodi folder.
Edit: If you want to just get rid of the master user account, you should be able to go to ~/Library/Application Support/Kodi/userdata and open the file profiles.xml. Highlight the contents of the file and paste this in place of it-
Code:
<profiles>
<lastloaded>0</lastloaded>
<useloginscreen>false</useloginscreen>
<autologin>-1</autologin>
<nextIdProfile>1</nextIdProfile>
<profile>
<id>0</id>
<name>Master user</name>
<directory pathversion="1">special://masterprofile/</directory>
<thumbnail pathversion="1"></thumbnail>
<hasdatabases>true</hasdatabases>
<canwritedatabases>true</canwritedatabases>
<hassources>true</hassources>
<canwritesources>true</canwritesources>
<lockaddonmanager>false</lockaddonmanager>
<locksettings>0</locksettings>
<lockfiles>false</lockfiles>
<lockmusic>false</lockmusic>
<lockvideo>false</lockvideo>
<lockpictures>false</lockpictures>
<lockprograms>false</lockprograms>
<lockmode>0</lockmode>
<lockcode></lockcode>
<lastdate></lastdate>
</profile>
</profiles>
This is the default with no profiles being used.