DEBian: How to correctly run /opt/COMODO/ & /etc./init.d/cmdavd ?..

I am completely newby in Linux… Can anybody explain me, please, in detail, how to run correctly ‘’/opt/COMODO/’’ & ‘’/etc./init.d/cmdavd ‘restart’’ command in understandable for me form, what shoul I do step by step?.. Thank You a lot!..

run terminal
sudo apt-get install mc
sudo mc

read to the end of the license, waiting for the completion of operations