<u>GUI method:</u>
1. Go to System -> Administration -> Users and Groups<br />2. Enter your root password<br />3. Click on Edit -> Preferences<br />4. Make Sure "Hide System users and groups" is unchecked and close the dialog box<br />5. In the list of Users find "transmission" and double click<br />6. In the Groups tab find "users" and make sure it is checked.<br />
7. Close all windows.
<u>Terminal method:</u>
1. Open Terminal<br />
2. Type
su
3. Enter your root password<br />
4. Type
usermod -G users transmission
5. Close Terminal