Add IP address to Firewall's whitelist to allow all of types of requests from it to your website.
Allow all requests from specific IP address.
Just click a Plus icon the left side of blocked IP address in Website Firewall report to add it to IP Whitelist. Any request from this IP address will be allowed to your website. As an alternative way you may use the Add Form in IP Whitelist to do this.
Or just click a shield icon (a shield with an arrow) at the right side of a sought-for IP address in a Website Firewall blocked threats report.