Change the URL of the "Continue shopping" button on thank you page

[master-gardener]

Hello! 

I'm new to Shopify and using the Debut theme on the site. On the thank you page, I need to change the URL of the "Return to store" button (the default label for the button is "Continue Shopping") to link to another website. I contacted Shopify support a week ago and I'm still waiting for the design team to get back to me. This website is for a non-profit, so we don't have the money to hire a Shopify expert. I would appreciate any help or advice you could give me. Thank you!!