Customize home page in community

Click on the gear icon in the top right hand corner

Navigate and click on 'community settings' on the drop-down menu

Click on Customize Navigation

Add the page you would like to serve as the community home page to the active page list by filling the checkbox

Click on the notepad correlating to the desired homepage

Toggle on the 'Set as Default Home Page' and select which users you would like to have this challenge home page for and click save changes