I cannot access my wifi Access Point even if I use the default IP address in my browser, what should I do?

Check that you are on the same subnet as this one, by changing the address of your computer:

Step 1 : Go to network and sharing center of your computer.

Step 2 : Click on LAN connection :

Step 3 : Change your IP address

Properties.
Choose « Internet Protocol version 4 (TCP/IPv4) » and go to Properties

Change thoses information : 

Adresse IP address: 192.168.188.200
 Network Mask : 255.255.255.0

OK

Do not forget to reset the parameters as it was previously once the configuration is done, otherwise you will no longer have internet access