No offence, but the fact that you keep on asking here about tainting a Free
system with something non-Free makes me believe that you just don't
understand the goal of this project.
Trisquel is not just another distro out there that just happens to be 100%
Free. This Freedom is the whole basis of this endeavour. We cannot and will
not help you with getting non-free software onto Trisquel because then we
will be providing a guide of how to sabotage your freedom using our official
communication channels. This will have various implications for the Freedom
movement we are a part of. Given your situation you will either have to
figure it out yourself or use another distro. I hope you understand?
I have sympathy with your dilemma. My laptop needs non-free firmware for its
built-in wifi so I ended up not using wifi for almost a year. In my situation
it was possible. I don't know yours. Do you absolutely need to use wifi on
that system?