simply typing `command --help` or `man command` will show you mostly the documentation/manual of the binary if devs were not lazy.
Not sure which images you use and if binary is called blindscan or octagon-blindscan, in case you are unsure, just run
find / | grep blindscan
it should list you the binary if it is anywhere, normally it is located in /usr/bin folder but depending of what folder structure dev chooses it could be also somewhere else.
Here is the help for octagon-blindscan and it clearly says how to use it, hope it helps you:
root@sf8008:~# octagon-blindscan --help Clap Blindscan tool for the Linux DVB S2 API Modified by Define for Enigma2 usage: clap-blindscan startfreq endfreq startsymrate endsymrate pol hilow feid socketid