once you install the QloApps it creates a fontend as to provide a fully functioning hotel reservation system. To edit the frontend you can create a new theme or edit the default theme "hotel-reservation-theme"
QloApps is based on Prestashop, please follow their doc to understand how theme works.

If you want us to make changes for you, please raise a ticket on https://webkul.uvdesk.com/en/customer/create-ticket/