How do i remove Apache2 Ubuntu Default Page?

Please, kindly need help, after deployed flask application on ubuntu 14 into this path var/www/FlaskApp, Accessing my IP, it display correctly, So, i decided to point my domain to digital ocean which display “Apache2 Ubuntu Default Page”, please how do i remove this default page to display the content on var/www/FlaskApp

Here is my folder structure

var/www
---------------------FlaskApp
--------------------------- templates
--------------------------- static
--------------------------- app.py
---------------------html
---------------------scrapy.cfg
```