How to POST submission data to my website?

I am not sure if I have understood your question correctly. Do you mean to say that you want to post your form's submission data to your own website?

Yes it is possible to achieve your requirement by taking advantage of our "POST Method". You can enable POST method in your form and then configure custom thank you page where you add your script to read POST data. You may like to take a look at the following guide which should help you:  https://www.jotform.com/help/213-Send-Submission-Data-via-Post-Method-and-Thank-You-Settings

Hope this helps.

Do get back to us if you have any questions.