Dawn Theme - Can I add text to the Order Confirmation Page?

[Molinoglass]

I need to add some important text to the Order Confirmation page. 

We are only getting a 30% open rate for our order confirmation emails and I suspect this is because a lot of our emails are going into customers Spam folders. 

I want to display text that tells them to check their spam folder for our emails and ask them to whitelist our domain.

I've searched everywhere I cannot find any way to do this and it seems like custom text would be an easy and obvious thing to do.

Thanks!

[Eric-HAN]

Hi,there  
you mean add some text on this page (below)

Unfortunately, this specific page cannot be modified directly within theme editors or certain configuration settings. However, you can leverage the flexibility of Shopify's checkout extension to implement custom development coding and achieve the desired changes.