VPNs rout all your PCs traffic through their "tunnel". If you only want browser traffic, you might do better by setting up a proxy server. Nginx can do that for example.
Proxy servers can easily be switched in browsers, for example with built in options or extensions like foxy proxy.
Besides that, you will need some kind of client software to speak the protocol of the VPN server. That could be protocol based like any openvpn or wire guard client, perhaps integrated with your os, but you will need some kind if software that knows the needed protocol.