How to edit text module inside markup


I am trying to allow user to enter URL src for iframe embeds inside for loop. The text module is not showing up on page editor.

{% for in range(widget.how_many_tabs|int) %}
<iframe width="560" height="315" src={% text label="Enter video embed URL", no_wrapper=True, unique_in_loop=True %} frameborder="0" allowfullscreen

{% endfor %}

Edit: solved by giving each text module a name