How to prepopulate checkbox label?

How to prepopulate checkbox label?- this link is security protected asking for a login. there are a few more also like this.

https://www.jotform.com/help/71-Prepopulating-Fields-to-Your-JotForm-via-URL-Parameters

That means that the thread was set to private by the creator of that thread.

If you would like to select a check box via the URL parameters, you can try this instead:

http://form.jotformpro.com/form/40808070054952?parentcheckbox86[1]=true  

Blue highlight: This is the field name of the check box.

Green highlight: This is the index number of the item or option in the check box, in my case, [1] refers to "Option B".

Yellow highlight: This states if the check box is ticked or not

So basically, if you want to check all of the boxes, you can click this link:

http://form.jotformpro.com/form/40808070054952?parentcheckbox86[0]=true&parentcheckbox86[1]=true&parentcheckbox86[2]=true  

Reference guide on how to check the name of the field box — https://www.jotform.com/help/146-How-to-Find-Field-IDs-and-Names 

I hope that helps. We will also update the said guide, apologies for the inconvenience.