I cannot entered 192.168.0.1 for d-link router at this moment. But why?

Here are the two most common reasons:
1. The router has been previously configured and its address is no longer the default 192.168.0.1.
2. The address of the computer used is not within the 192.168.0.0 / 24 network.

Use the hints section to post your IP information.
https://www.askmehelpdesk.com/networking/networking-diagnostics-helpful-hints-282387.html