TP-Link M5350 User Manual page 40

4.4.4.3. Modify Password
It is strongly recommended that you change the factory default login password of the device.

Old Password/User Name: The old password/User Name that is used to log in of the
device.

New Password/User Name: The new password/User Name you want to set for the login
of the device.

Confirm New Password: Enter the new password again for confirmation.
Click Save when you finish the setting.
Click Clear to clear all the values you have already set, and then you can reset it.

Note:
The new password must not exceed 14 characters in length and not include any spaces.
Figure 4-29 Modify Login Password
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M5350 3G Mobile Wi-Fi User Guide