issue with openlane root of riscvduino

[Vinayakamk]

hello sir,
i wanted run the design by installing riscvduino n i skipped step 1 as i already have Docker version 20.10.21, build 20.10.21-0ubuntu1~22.04.3

i have git cloned this riscvduino as this repo directed,but
in rtl to gds flow
i coudnt able make pinmux or just make ,as it says this issue

how can i fix "export openlane root"

is this bcz of i skipped step 1, {i left it, as -agent in second line of step 1 is an error}
can you please help me as im very new to these things.