The great firewall of china

im trying to help a chinese friend to overcome the great china firewall while using Bisq and Tor, whit no success even while running a Tor proxy with Obfs on a different machine.
anyone haves any idea how to help him? he cant even access this forum.

Your friend should try to configure the Tor settings in order to connect to a bridge.
He may have to try several bridges before finding one which works.
See eg Client could not open

Things are also doable by using a VPN, but my understanding is that it is not stable.
And also the authorities may take notice of your attempts.

This forum shouldn’t be blocked in China, as far as I can see.

You should try meek-azure bridges until you find the one that works, those should work generally for China.