Is it possible to make buttons on home page (greenr Theme) clickable

Hi all,
We have almost completed the webite but the button icons on the home page are not clickable. I have tried adding extra code into the space for the fa fa icons but it doesn’t work. Does anyone know if this theme supports clickable icons and if so the best way to achieve this.
site is ctoma.org.uk sorry having issues inserting a clickable link
Thank you in advance.