Make sure under root settings in the options of the app that you have Root Explorer ticked.

If you need to make changes in / then you need to make sure that right under the Root Explorer setting you have Mount File System ticked also.

You should be able to tap on Favorites at the top in Es File Explorder and then tap on / to get to the root directory.

Also check your path settings. They should look like mine.

 

/ is the root.

"Root" is just a folder. Probably should leave it alone.