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I wanna bridge the campus wifi so that all my devices can connect to it and can share files through my own router at the same time.

But I didn't find any place to enter the username but only passwords.

Is there any way to do this?

Thanks

Do you mean it requires a web page authentication?
If yes, TL-WR841N does not support the portal wifi.
If you mean the PPPoE dial-up, you can set LT-WR841N as a wireless router and choose PPPoE connection type as the WAN connection.