Settings -> Internet Connection -> Edit Networks -> Choose Network -> Advanced Settings -> Socks 127.0.0.1/Port 9050. Done -> Reconnect.

Open terminal

Type in terminal "tor" without quotes, enter.

Swipe right to minimize terminal (dont close it)

Open browser

Edit: you may also run "tor RunAsDaemon 1" in terminal, that should keep it running. The benefits of having the terminal open, is that once you close the terminal, tor is terminated and no longer active.