Grammar

This is my first post, I’m still stuck on getting past/find correct page that’s not 403 error…
someone stated it’s not brute forced and you need to send a special http request… I’m totally lost here. I tried dirb at index.php and a few other content discovery techniques with no luck… I watched the video too, no help there except lots of buzz words causing me confusion…

Help would be greatly appreciated. or message me. thanks,