I want to change my password but I can't get in with the username admin and the password motorola

SOURCE: forgot passwrd on a us robotics router

Generally you have to push and hold the reset button, i suggest for 30 seconds, this should completely reset the unit, including passwords and settings.

SOURCE: sharp ar-m237 default username and password

admin
Sharp

SOURCE: Forgot username for admin acc in windows xp

Forgetting your Windows administrator login password. With no way to get into the system, you can’t even perform basic maintenance, let alone a thorough tune-up. Formatting is always an option, but we consider that a last resort. (Plus, guess who’s going to have to help reinstall all the programs lost after a wipe?) But all hope is not lost. There are a few ways to actually retrieve a lost Windows account password. Read on, and we’ll show you the light.

1st Method:
The first thing which you check if you forget login password. When we install Windows, it automatically creates an account "Administrator" and sets its password to blank. So if you have forget your user account password then try this:
Start system and when you see Windows Welcome screen / Login screen, press ctrl+alt+del keys twice and it'll show Classic Login box. Now type "Administrator" (without quotes) in Username and leave Password field blank. Now press Enter and you should be able to log in Windows.
Now you can reset your account password from "Control Panel -> User Accounts".
Same thing can be done using Safe Mode. In Safe Mode Windows will show this in-built Administrator account in Login screen.

2th Method:
There are a lot of Windows password revealers and crackers available, but we’ve found that Windows Password Recovery Tool is the most effective.:
Windows Password Recovery Tool is one of the easiest password recovery tools to use. It allows you to reset a user account password, including the Administrator password. It is also a relatively small download.
Windows Password Recovery Tool Service: http://www.windowspasswordsrecovery.com

SOURCE: DI-624 can't login as admin

I was ready to give it up and pitch the thing, but I found this on another board and it worked:

login - admin
password - password (not blank)

SOURCE: what is the admin username and password

Default user is "admin" and password is "admin" or blank or "password"
if above password not works then reset your router to defaults.
For that press RESET button it is in back side of router.Press it for 10 seconds then try http://192.168.1.1
or
http://192.168.0.1
connect your router to computer with ethernet cable then try above link and user name and password.
Let me know if you need further assistance.
Thanks for using FixYa.

Testimonial: "Instant reply, thanks a lot :) Much appreciated."