Remove icons from system tray on Убунту Гноме 15.10

I have installed the расширение Topicons and I want to remove the icons that I don't need like the orange skype icon because I have an расширение for skype эксперт you хан see in this image

I have searched and tried some solutions but nothing seems to work.

If you пахал having trouble understanding what I want

I want to be able to remove icons that I don't want from the system tray on the bottom left угол.