Nearly every SharePoint site has an "Owner" that is a member of the department it relates to. This allows each department to be self-sufficient about assigning permissions and creating new content.
The administration resources are intended to guide site owners through the most common functions (creating new sites and assigning permissions). However, please don't hesitate to contact IT Support if you have further questions.
Information on creating new sub-sites and the information required for IT to create a site on the root of the SharePoint server.
How to assign permissions to the SharePoint site for which you are an owner.
In most cases the "Owner" of your department's SharePoint site is the department admin assistant. If it isn't them, they usually know who it is. However, if that is not the case, please contact IT Support to retrieve that information.