How to embed form and make it secure

We are needing to upload a form so that it's fillable for our clients and it needs to be secure

I am not sure where you want to upload your form. 

When you create a form you can embed it to your website or you can sent direct link of your form to your users via email. Inside of this article you can find out how to embed a form to the website:

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

Also you can create Fillable PDF form from your web form.

http://www.jotform.com/help/312-Fillable-PDF-Everything-you-need-to-know-about-JotForm-Fillable-PDF-Creator 

Inside of this article you can see how to make your form to be secure:

http://www.jotform.com/help/63-How-can-I-receive-SSL-Submissions 

Please note that free users have monthly limit of 10 SSL submissions. 

Hope this will help. Let us know if you need further assistance.