How do I reset the router password on a D-link DI-624?

reset the router by holding the reset button in with a paper clip for 30 seconds when you power it on.
then login using admin password admin.

Here is a site that will help you most of the D-Link routers: http://www.default-password.info/d-link/
Here is an extract: D-Link DI-624 - all admin (none) - Admin access (HTTP) User (none) - Admin access (HTTP)

The default userID and password for the DI-624 can be one of 3:

1st userID: admin password: (none) leave it blank

2nd userID: User password: (none) leave it blank

3rd userID: admin password: admin

Hi, when you reset your router the password is reset to default, and that default is admin admin. And to reset it, at the rear is a small hole in the hole is a button, remove from the power, and depress the button for a few seconds, then connect the power and try to logon again with your browser using the default settings.
It is also all explained in your user manual link below...
http://www.retrevo.com/support/D-link-DI-624-Wireless-Routers-manual/id/420ci368/t/2/

there is a way you might have to type it in google or call the company that it was made from if not try holding the button that will reset it but you have to configure the settings again

hold the reset button for 10 seconds then let it sit till the lights stop flashing. then you'll be able to log into the router w/ the default user/password which I believe is admin/password. the ip should be reset to 192.168.1.1 so type http://192.168.1.1 in your browser to log in.

When you reset a router, it restore its settings to factory-default. If you are attempting to log in to the router's control panel, you will now have to use the factory default login credentials.

These credentials are:

Login: admin
Password: admin

Let me know if I can assist you further, or if I need to explain any of what I mentioned above in more detail.

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'user' login is just read only, so you really cannot change any config.

so when you reset the modem have you tried to login with "admin" and the default password? if not try to reset it again, but pushing the reset button at the back of the router for a few seconds but before that search for the default password of your router in some search engine. like type in the model of your " 'router' default admin password "

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)

The following reset procedure will completely restore the default settings on the VDI-604 and VDI-624. Note: If you do not remember your password, you will have to reset the router to factory defaults. Step 1 Locate the reset pinhole on the back of the unit. Step 2 With the unit powered on, press and hold the Reset button. Step 3 Hold the Reset button for about 10 seconds. Step 4 Release the Reset button. Step 5 The unit will reboot. Allow 20-30 seconds before reconnecting. Step 6 The device is now at factory defaults. Note: Do not recycle power during the reset procedure. VDI-604 firmware 1.05F/VDI-624 firmware 2.39DDM - The default username is admin and the default password is blank (nothing). VDI-604 firmware 1.07 Build 28/VDI-624 firmware 2.43 Build 12 - The default username is admin and the default password is password. Note: After resetting the router to factory defaults, you will need to contact Verizon to reconfigure your WAN settings.