The first and most important tip towards securing a wireless network is to change the default password of your access point. When vendors ship these hardware devices, the password to allow full administrator access is almost always very basic examples include “ad min”, or even the manufacturer’s name in man
       
For this reason, you should always assume that if you leave the default password as is, anyone can easily access, control, and configure your access point, allowing them unrestricted access to your network. In fact, without changing the default password for your access points, every other tip in this article is a moot point, since external users could easily connect to and undo or revise any security features you might have implemented.
             
To that end, some access point hardware provides a configurable option that does not allow access to the administrative console of the device from wireless clients. If your access point supports this feature, you should definitely enable it, thus restricting administrative access to wired connections only.

Steps required in changing the password are:-
Log into the network router.
Navigate to the router's Change Password Page.
Choose and a enter a new password.
Save the new password.