Insert Text into PopUp Field (text input)

I am using Wordpress.

There are a lot of posts, each post has a user e-mail address.

I have installed PopUp form. So next to each e-mail there is a button "Email Author".

PopUp form has input fields like:

1. Send to: Here should be Email taken from the post
2. Your Email:
3. Message
4. Send Button

What I need is to take the Email Address and insert it (like real value) into the "Send to:" input field in PopUp when a user clicks the button in the post "Email Author".

How to do it using jQuery and JavaScript?

Here is the code of the post:

<article id="post-3889"    class="post-3889 post type-post status-publish format-aside hentry category-sex post_format-post-format-aside"><div class="aside"><h1 class="entry-title"><a href="http://example.com/2020/04/01/%d1%82%d0%be%d1%80/" rel="bookmark">                Looking for a girl!</a></h1><div class="entry-content"><p>I am alone and looking for girls in CA.</p><ul class="wpuf_customs"><li class="Age"><label>Age</label>: <span>24</span><a href="" class="dop sendMessage popmake-se pum-trigger" style="cursor: pointer;">write</a></li><li class="Parameters"><label>Your parameters</label>: <span>190.70.19</span><a href="" class="dop sendMessage popmake-se pum-trigger" style="cursor: pointer;">text</a></li><li class="Goal"><label>Goal</label>: <span>Chat</span></li><li class="E-mail"><label>E-mail</label>: <span><a href="mailto:samplemail@gmail.com">samplemail@gmail@gmail.com</a></span><a href="" class="dop sendMessage popmake-se pum-trigger" style="cursor: pointer;">                        Email Author of the Post!</a></li></ul></div><!-- .entry-content --></div><!-- .aside --><footer class="entry-meta"><div class="cols"><a href="http://example.com/2020/04/01/%d1%82%d0%be%d1%80/" title="Permanent link: Looking for a girl!"                rel="bookmark">5 hours ago</a></div><div class="cols comentz"></div><div class="cols"></div></footer><!-- .entry-meta --></article>

And here how the PopUp form looks:

<p><label>Send to:<br><span class="wpcf7-form-control-wrap to-email"><input type="email" name="to-email" value="" size="40" class="wpcf7-form-control wpcf7-text wpcf7-email wpcf7-validates-as-required wpcf7-validates-as-email" aria-required="true" aria-invalid="false"></span></label></p>