TP-Link TD-8840 User Manual page 11

Then you will see the Figure 3-3. You will see some information such as link rate and so
on.
Default value of user name and password is "admin"; if you want to change them,
please go to "Management"
TD-8840 External ADSL2+ Router User Guide
Figure 3-3
"Access control" "Passwords". (Figure 3-4)
Figure 3-4
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