If you attempt to generate a report, and nothing happens, then that most likely means pop-ups are being blocked on your browser. You can allow pop-ups by clicking the "Pop-up blocked" icon in the browser address bar, as per screenshot below.
If prompted to allow pop-ups, select the "Always allow" option.
To prevent the browser in the first place from blocking pop-ups, you can set up the browser to allow pop-ups. Instructions to do so can be found in the following article: Allowing Pop-Ups on your Browser.