For XenForo 2.1 add below code to your extra.less template:
/* Icons for...
- Related resources
cXF Service - Rate and ReviewThis "resource" is only to evaluate and review our support and services. If you like our support with customisations or any of the other help you can get here at customizeXF, please leave us a review. If you got our add-ons on websites other...www.customizexf.com