Constant Contact API Redirect to thank you page

Hello,

I am trying to redirect people who sign up for my club via the constant contact api form on my home page to a thank you for signing up page. The form is on my home page. (https://www.weekendertravelclub.com). I have tried going into the settings to edit the constant-contact-api/widget-form-designer.php code and found this:

<tr valign=”top”>
<th scope=”row”><p><label for=”<?php echo $this->get_field_id(‘redirect_url’);?>”><span>Signup Widget Thanks Page</span></label></p></th>
<td>
<input type=”text” class=”widefat code” name=”<?php echo $this->get_field_name(‘redirect_url’);?>” id=”<?php echo $this->get_field_id(‘redirect_url’);?>” value=”<?php echo $this->get_value(‘redirect_url’, $instance); ?>” size=”50″ />
<p class=”description”>Enter a url above to redirect new registrants to a thank you page upon successfully submitting the signup form. Use the full URL/address including https:// Leave this blank for no redirection (page will reload with success message inside widget).</p>
</td>
</tr>

It says to enter the url “above” but there are 4 different places where it has (‘redirect_url’). Can anyone please tell me where i need to put the url i want to redirect to? (https://www.weekendertravelclub.com/thanks-for-signing-up/) I would really appreciate any light shed on this. Thanks in advance!