How to change my Joomla website's content?

I'm new to Joomla (I used to work with Wordpress) and I need your help. I need to edit the link in "Download Company Profile" button of this website. I tried to check in the menu option and it shows that the page using Featured Articles. But when I check the Featured Articles, I found nothing. I also tried to check the module position, the module content, but it also shows nothing in the editor.
Anyone know what's wrong? Or is there any other way for me to change this? Thank you.