In the Rules section, select Add rules and select Add my own rules and rule groups
Select Rule type as IP set , name Rule
In the Ip set section, select the MyIpSet just created earlier
Leave all the rest as default and create Web ACL then
Wait a few minutes and F5 the browser again with the url as DNS of the Load Balancer we opened earlier, you can see we have blocked our own IP and it worked, you can install a few extensions to change IP and test again