The official twitter app used to have proxy settings, not surprisingly it had been dropped.
After installation, simply go to
Settings > Network
And set your proxy as:
localhost (you can alternatively write 127.0.0.1)
Proxy port: 8118
This would securely route your traffic to your TOR network, provided that you have installed Orbot on android, available here
In order to be anonymous your twitter registration should be done anonymously. If you do not have a VPN connection, you should use TOR browser to register an anonymous email and also twitter signup.
How to setup Friendica on Twidere?
See this great tutorial.