Now you should have newest Transmission client.
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How to add a password to Transmission Web Client
NOTE: Do all tasks as ROOT
1. Stop the Transmission service:
service amahi-transmission stop
2. Edit the settings.json.
nano /var/lib/transmission/.config/transmission-daemon/settings.json
3. Edit these fields
"rpc-authentication-required": true,
"rpc-bind-address": "0.0.0.0",
"rpc-enabled": true,
"rpc-password": "[Insert wanted password]",
"rpc-port": 9091,
"rpc-username": "[Username wanted]",
CTRL-X to save.
4. Restart Transmission Service
Service Amahi-Transmission start
Now naviagte to web address and input information and you're all set!