I checked your record and found that you purchased club in March 16. With club purchase you get 1 month of free plus support and free updates & new releases for a year. After that for assitance with custom CSS you will need to signup for plus support – https://cyberchimps.com/plus/.
Currently social icons are can be seen in header are. But I quite didn’t understand what you mean by it does not work with banner. Can you please explain ?