Drop your new document (.qvw) in the Document Root.
On a modern Windows server this is C:\ProgramData\QlikTech\Documents. QlikView server will automatically pick up this new document and make it available in the AccessPoint.
Navigate to the AP (open browser and enter URL http: //servername/qlikview - replace servername with the actual hostname of your QlikView server) and click on the thumbnail that represents your new document.
Note: first you'll have to assign CALs to specific users if you want to make this document available to others.