1. Network:
-Log on to the network service portal of Tianjin University (such as educational administration system or student system) to find contact information.
-If you look up the contact information on official website of Tianjin University, you will usually find something like "Contact us", including the contact information of the system administrator.
2. Telephone:
-Call the Computer Center or Academic Affairs Office of Tianjin University and ask them how to contact the system administrator.
3. Mail:
-Send an email to the Computer Center or Academic Affairs Office of Tianjin University, describing your problem in detail, and ask them to convey it to the system administrator.
4. Go to the relevant office:
-If you can get the specific address and office hours, you can also go to the computer center or the academic affairs office in person and ask the staff directly.
Please remember that the above methods may change according to the specific situation of Tianjin University. It's best to find relevant information on official website of Tianjin University or contact relevant departments of the school to get the most accurate contact information.