Did you watched this video tutorial about “How to Setup WHMCS Bridge Page on HostWHMCS – Responsive Hosting and WHMCS WordPress Theme”? https://www.youtube.com/watch?v=AlPJOLmGwLI&t=0s&list=PLbmIKrgYlRbpUN1Y2pG2-cqTdXgvUlW6d&index=8
However, you could follow the steps below.
1. Install the WHMCS Bridge Plugin
2. Settings up the WHMCS Bridge Plugin to follow the screenshot http://prntscr.com/j44at6 http://prntscr.com/j44b6y
3. Edit WHMCS Bridge page form All Pages (There will be two WHMCS Bridge pages, you could delete one)
4. Select Whmcs Page as Template from the bottom right option http://prntscr.com/j44cj2
Best Regards,
ThemeLooks Support Team