First Access your Go to Folder in Go tab

In the following screen put "/Users/" and click on Go button

After clicking on "Go" button the following screen will come. Here you will need to choose your Username

Now you will need to open the "Library" folder. If Library Folder doesn't appear here then use Command + Shift + . (dot) keys simultaneously, all hidden files will appear

Now open the "Application Support" Folder under "Library" folder

In "Application Support" find the "com.ImsiTech.MavisBeaconKeyboardingKidz" folder and open it. The User_Database file will be available there.