How to embed a url into the ThankYou page?

Through Zapier or any other way I can figure out, is it possible to embed a url into the thankyou page that would take users to my account in my email responder program DirectMailMac.com? 

Zapier doesn't have a way, and you also have tried to do this, so I've got to figure out a workaround that doesn't involve extra steps.

You are able to redirect your users to an external URL instead of default Thank You page. 

I have cloned your form named "One on One Strategy Session Application" on my side in order to investigate it. As far as I see, you're using the new form layout. You can only redirect your users to an external URL or you can show the default thank you page. Please click on "EDIT THANK YOU PAGE" button at the end of your form in the form builder and then select "Redirect to external link option". Enter the URL as you can see in the following screenshot: 

So that, your users will be redirected to https://directmailmac.com/ after submitting the form.

Please check the following guide for detailed information: https://www.jotform.com/help/38-Redirecting-Users-to-a-Different-Page 

Besides that, you are able to insert links to the thank you page in our classic form layout. You are able to switch the form layout to our classic form layout as you can see the screenshot below:

After that, refresh the page and you will see one more module for the Thank You page in the Settings tab. You can insert links to the Thank You page and change the design as you wanted as seen below:

Please find further detailed information at the following guide: https://www.jotform.com/help/211-Setting-up-the-Thank-You-Page 

However, please be informed about that the form design will totally change. 

I hope this explanation helps. Please tell us if you need further clarification or assistance.