You should be able open any program on your computer from the Start menu.
To add a shortcut to a program to your taskbar, find it in the Start menu, right-click on it and select More > Pin To Taskbar.
However, despite of all the foregoing advice, pop-ups on your computer are far more likely to be associated with malware than with ads supplied by websites. If you've
already got Malwarebytes Anti-Malware on your computer, run it now. I don't recommend a fresh installation of it though, as it forces you to take a free trial of the paid-for version, which has been known to slow some computers down quite a bit. Instead, download and run AdwCleaner (which is 'out of the same stable' anyway):
https://www.malwarebytes.com/adwcleaner/
(There's no installation involved. You simply run the downloaded file directly, accepting the option to zap anything nasty that it finds).