how to do in IFrame popup window to submit main form

I am working with IFrame
currently I have one main form i.e project, Inside an IFrame exists.
In IFrame, I have button, If I click a button, this will open a popup window.
In popup window I am doing some process. After completion of process, if click OK button,
through Javascript : I am posting the page through URL
I am using window.opener.href function, this function is doing in IFrame workarea(i.e URL connecting in IFrame)

MyCase is "I want to post the main form when I click on OK button in PopupWindow"
Is there any process, to submit main form.

Who is Participating?
RoonaanConnect With a Mentor Commented:

ZvonkoConnect With a Mentor Systems architectCommented:
And if your main form is not named "main" then you can use Roonaan's proposal with the index to the first form:


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