How to edit this template?

Hello everyone,

I am new to Illustrator and Photoshop. I downloaded the following the template from Stock 
https://stock.adobe.com/uk/search/free?k=quill&search_type=recentsearch&asset_id=368558996

However, I can not change the text to put the name of my project and the tagline. 
It is a free license. 

Thank you for your attention.

Cordially,

Lucia