Can I set the form with a custom url so that the entire form resides on my website?

I also have a SSL certificate for my website.  Can I set the form with a custom url so that the entire form resides on my website?

Please check this guide to  "How to use custom domains with Jotform", If you have another question non-related to this one, please open a new thread, we will be glad to assist you.

Just to let you know, the form does not have to be a secure form when using custom domains, since it is not supported. 

As an alternative you can use custom URL instead of Custom Domains, in that way there will not be need to unsecured your form since it supports SSL forms.