How do I use Skype for Business/Lync collaboration tools?
Microsoft provides documentation for this.
Integrated within the Voice (Lync) and Email (Exchange) portions of Unified Communication are additional collaboration tools which unify a wide variety of additional tools into a single package. This includes, but is not limited to: desktop video and teleconferencing and instant messaging, desktop and application sharing, and online meeting coordination with both internal to campus and external collaborators through the browser based Lync Web App.
Please refer to Microsoft's support page for details how to's and videos.