To change the wireless password on your D-Link router, you need to open the router's configuration page in a web browser. When you enter the configuration page, change the password in the Wireless Settings menu.
Steps
Part 1 of 3: How to open the router's configuration page

Step 1. Launch your web browser
Do this on a computer or device that is connected to a wireless network. It is best to use a computer connected to the router via an Ethernet cable, because all devices connected to the wireless network will be disconnected from it when you change the password.

Step 2. Enter 192.168.0.1 in the address bar
This is the address of the configuration page for most D-Link routers.

Step 3. Enter 192.168.1.1 if the previous address does not work
This is another address for the configuration page of many routers.

Step 4. Enter http:// dlinkrouter if none of the addresses work
This hostname can be used for many newer D-Link routers.

Step 5. Enter the address of the router if nothing works
If you still can't open the configuration page, look for the router's address on your computer:
- In Windows, right-click on the Network icon in the system tray. Click "Network and Sharing Center". Click on the "Connection" link next to the active connection at the top of the window. Click the Properties button. Copy the address that appears on the "Default IPv4 Gateway" line. This is the address of the router.
- In Mac OS X, open the Apple menu and choose System Preferences. Click Network. Select an active network connection. Click Advanced. Click on the TCP / IP tab. Copy the address that appears in the "Router" line.
Part 2 of 3: How to Enter the Router Configuration Page

Step 1. Enter admin as the username
This is the most common default username for D-Link routers.

Step 2. Do not enter anything on the Password line
Many D-Link routers do not have a password.

Step 3. Enter admin as the password
If you can't log in without a password, try entering "admin" (without the quotes).

Step 4. Find the factory login and password for your router
If you still cannot access the configuration page, go to www.routerpasswords.com and select "D-Link" from the menu. Find your router model in the list and copy the displayed username and password.

Step 5. Press and hold the “Reset” button on the back of the router if you are unable to enter the configuration page
If none of the usernames and passwords work, press and hold the Reset button on the back of the router for about thirty seconds. The router will reboot (this will take 60 seconds). Now use the default username and password.
Part 3 of 3: How to Change the Wireless Password

Step 1. Click the Wireless tab
If you don't see this tab, go to the Setup tab and click Wireless Settings in the left menu.

Step 2. Open the Security Mode menu

Step 3. Click Enable WPA2 Wireless Security
If you are not going to connect old devices that do not support WPA2 to the network, always use this particular security protocol, because it will reliably protect the network.

Step 4. Click on the Passphrase field

Step 5. Enter your password
The password should not contain words that are in the dictionary, so that it will not be picked up / guessed. This is especially important in densely populated areas.

Step 6. Enter the password again in the Confirm Passphrase field

Step 7. Click on Save Settings

Step 8. Enter the new password on the devices to connect them to the wireless network
When you change the password, all devices will be disconnected from the network, so enter the new password to connect them.