Probably, your theme uses custom Login form. Follow the next steps in order to add 2-Step Verification to a custom Login form on your Wordpress website:
1. Install the 2-Step Verification plugin and activate it.
2. Open the file (PHP or HTML) with the form (where you would like to add 2-Step Verification to).
3. Insert the following line to display the Google 2-Step Verification.
`do_action( 'gglstpvrfctn_custom_login_form' );`
`<?php do_action( 'gglstpvrfctn_custom_login_form' ); ?>`
This article related to 2-Step Verification by BestWebSoft plugin
Additional resources: 2-Step Verification - User Guide
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