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===Install Magisk Manager app===After phone is rebooted to desktop connect data cable and choose file transfer.Make sure you copy MagiskManagerxxx.apk file to the ../Internal shared storage/Download folder of the phoneGo to the phone file manager via the app menu and use the file manager to navigate to the Download folderTap on the MagiskManagerxxx.apk file to install itRun Magisk Manager appThe Magisk Manager is not the the Magisk App. I found out that I had to install magisk mangager from what I downloaded earlier, then install it from recovery. After reboot to the desktop I could open magisk manager but it indicated that magisk was not installed. ??? So they must be 2 different parts. The install option only allowed me to download a zip file. So I downloaded that to the download directory and reboot back to recovery. From recovery I choose to install the zip file. Then I reboot the phone.