Once you have installed the code you can add a menu to every SSRS item that has an “action” property, which is basically everything.

Every menu consists of one or more (max. 7) menu-items.
Each menu-item has three properties:

 

The menu is always displayed where the mouse was clicked and will disappear when either a menu-item is clicked or a spot outside of the menu is clicked.

To add a menu to a link you go to the action property of the report item and choose “URL” as the actiontype.
In the expression editor you add the following expression

 

this will create a menu with three items