1. Open the IIS (Internet Information Services (IIS) Manager). Navigate to the following, Host > Sites > Default Web Site. Right click the Default Web Site > Manage Website > Stop.
2. Now, right click again the Default Web Site and select Edit Bindings.
3. Select the HTTP port of 80 and click on Edit. Change the Port from 80 to any value (as long as no conflict with other running ports). Done!