Witcher - How to add a new skill

I'm trying to add a new skill into my Witcher campaign and I can't figure out how. Help is greatly appreciated. Thanks in advance. :)

Hi Orander! I don't know if there's more than one sheet to run a Witcher campaign with, but it's a good idea to post the name of it in a question like this, since different sheets handle tasks differently. You can find the name of the sheet on the Campaign Settings page. If you do not have access to the page due to not being the game creator, a screenshot of your character sheet can help.