SharePoint Designer 2013 workflow service

Hello,

I installed SharePoint Designer 2013 on my workstation Windows Server 2012, but when I try to create a Site Workflow, I get the alert about the Platform Type:

"The option for the SharePoint 2013 Workflow platform is not available because the workflow service is not configured on the server. Please contact your administrator".

So, how can we configure the workflow service?

Thanks for your help.