Before starting this tutorial, heres two differences: using bridges is to hide your connection to Tor from ISPs, using a proxy would be to completely anonymize your connection to Tor.

Step 1: Edit torrc file

• sudo nano /etc/tor/torrc

Step 2: Add theses lines

For a HTTP proxy

• HTTPProxy / HTTPSProxy host[:port]
• HTTPProxyAuthenticator / HTTPSProxyAuthenticator username:password

For a SOCKS proxy

• Socks4Proxy/Socks5Proxy host[:port]
• Socks5ProxyUsername username
• Socks5ProxyPassword password

For a TCP proxy

• TCPProxy protocol host:port

For a bridge

• UseBridges 1
• Bridge [vanilla/obfs(3/4)/snowflake/meek] IP:Port [fingerprint]