As you already know from the “How SmartJobBoard software works” section of the Manual the front-end layout is based on the templates system. Front-end Homepage template is called “main.tpl”.
All changes you make to this template will be applied to the homepage only.
“Edit Homepage Template” Quick Link will redirect you to the Templates > Edit Templates > Main > edit main.tpl page of the Admin Panel.
More information about this page of the Admin Panel you can find in the Edit Templates section of the Manual.