Can't access Craigslist even using the recommended bridges when I set up Tor on my pc. Can anyone offer a solution? Thank you.
Craigslist actively blocks Tor exit nodes, so there is nothing you can do. Using bridges will not make a difference.
While for me accessing craigslist.org works using Tor Browser now, in cases of webservices that completely block Tor, you can only find a proxy you connect to first, that connects to the website then on your behalf. A simple test would be to search at startpage.com and use their "proxy" Link at your search result.
You other option would be to contact the website technical staff and discuss better (or, "actual") security measures than blocking traffic from the Tor network. Malicious traffic is everywhere, by far not only at Tor Exit Relays. If they block everything, they don't exists anymore, so...