Cannot use su in terminal

  • After gaining root and installing LineageOS 13.0.20170715-NIGHTLY-manta plus the to enable root once booted into the OS.
    I have installed SuperSU version 2.82 but could only see RootChecker in the apps tab. So I tried uninstalling this and installing version 2.79 which then prompts me to upgrade the SU binary. I can still only see RootChecker in the apps tab.

    I would like to be able to become super user in the terminal, just so that I can edit my hosts file but I get "su not found".
    What am I doing wrong?


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