bruni beretta,slide release??

Ok folks firstly,a great forum for collectors like me!.ok in my collection i have a bruni bbm beretta mod 92,,iv had one before but this ones different,i need to take slide off so i can get some custom work done but the release pin isnt functional just cosmetic,so my question is how do i take the top slide off as there is nothing that allows me to do it,no pin to take out etc....any help would be awsome,has anybody got one?,or just know how this can be done,surely its possible due to cleaning and fixing ect,please help,thanks

Here ya go!

https://youtu.be/-_p6XrIN4lU

Yeh that's not it mate lol,i dont have a release pin that's functional,after alot of hunting ive found a diagram and it needs to be totaly taken apart from the back,pins etc,thanks mate