How do I share this form to my website?

Publishing of Form is categorized under 3 broad categories. You can either use the direct link as shown in screenshot1 under "Direct Link of your Form"

Or you can embed the code on your existing site by copying the code under EMBED option shown in screenshot 2

The following article would be helpful deciding which option you should chose.

https://www.jotform.com/help/67-Which-Form-Embed-Code-Should-I-Use

Hope this helps.