How to assign to job using HTML code of a web form

How to assign to job using HTML code of a web form

Hi, I use the HTML code of a webform to use on my website, how can I have candidates assigned to the desired job opening ? When using the webform URL, it works fine and the candidate get ASSIGNED. But when using HTML source (or even embed code or iframe) it doesn't and the candidate remain as NEW. 

I suppose I need to adapt the code somewhere ? In the HTML code I see :

<input type='text' style='display:none;' id='applyjobid' name='applyjobid' value=''>

Is this the part where I can specify the job to assign to ?

I hope someone knows a solution. Many thanks for your advice