If you cannot find a skill that you are looking for, or are looking for some particular help or advice on a particular subject, you can make such a request in the Requests feature which can be found at the top of the sidebar on the Home page.
Up to 10 requests will be listed on the sidebar but you can see a full list by clicking on the “See All Requests” link. There are currently 6 categories to chose from – Advice, Coaching, Consulting, Other. Tech Help, & Virtual Assistance (Other categories can be added as required). By clicking on the name of the person who made the request you will open up a personal message dialogue box where you can respond in person in answer to that request.