click WAMP icon -> Apache -> httpd.conf and find listen 80
new versions of WAMP uses
Listen 0.0.0.0:80
Listen [::0]:80ServerName localhost:80
Change Port Number as you want, like
Listen 0.0.0.0:81
Listen [::0]:81ServerName localhost:81
and now restart Wamp, thats it
and in web browser type as
Happy Coding..