Found in People & Teams Module, here you can view, add and edit all of the skills that are important in your organisation. Skills can be added to a users Profile and aggregated in the Team view. 

Use the Filter to search for skills. To edit press  and   to delete.

Select the relevant Skill to view the details. To edit from here press

To update the icon open the skill and press  

To upload drag a file over or press upload.