Magento 2 Popup Login v2.x Developer's Guide & API Reference
From Plumrocket Documentation
You are viewing: 
Popup Login
Display Popup Manually
In order to configure the Popup Login Extension for a particular page element, you will have to select "Manually" for the option "Display Popup" in the extension settings as shown below.
You will also have to add a class "show_popup_login" to the object to trigger the popup login.
Code Example
<a href="/seespecialevent" !!-class="show_popup_login"-!!>See Special Event</a>
In order to display selected popup form after click on link, you need to add the parameter data-form="registration".
Code Example
<a class="show_popup_login" !!- data-form="registration" -!! href="http://yourstore.com/magento2/index.php/customer/account/create/">Create an Account</a>
Disable Popup Manually
If you want to disable Popup only for a particular element on the page, you will have to add the parameter data-popup="off" to the selected element. For instance, if you want to disable Pop up for the "About Us" link, you will have to edit the code.
<a href="/about/">About Us</a>
making the following changes:
<a href="/about/"!!- data-popup="off"-!! >About Us</a>
On Top