If anyone is still having trouble I had to open es fike explorer and open settings. Choose root settings and turn on 'root explorer' and also 'mount file system' To open seetings press 3 vertical dots next to 'recent apps' button. If es file explorer says it cant get super user access then you need to open super user program and change setting there under security - automatic response. If it is set to deny change to prompt or allow. To open seetings press button in upper right corner.
Thanks to those that helped an old illiterate geezer like me root his first android device and get a decent app store.