Very slow system startup and shutdown

Thanks for the hint. Into a
/etc/dracut.conf.d
I don’t have the file
myflags.conf
I created it and entered the entry
omit_dracutmodules+=" brltty "
Now I have to put
myflags.conf
into a
/etc/dracut.conf.d
correct?
If yes I can’t write on that folder, can you tell me how to do it? Thank you.