Your wifi card may not be supported by Trisquel, as Trisquel by its very
nature of being free software (as in freedom), does not permit software that
is non-free (as in imprisoning) - including some wifi drivers.
It MAY be possible to get your wifi card working, but this is an ethical
issue for some here to assist in this.
If you don't know if it is, open up a terminal and type in
lspci -v
and scroll through the returned results until you find your wifi card. You
can run a search on your wifi card and it may be supported. Ubuntu forums are
probably the best place to look. If it is, it's then your choice whether you
would like to install software that does not respect your freedom, or
consider buying hardware run with free software e.g.
https://www.thinkpenguin.com/catalog/wireless-networking-gnulinux
