Custom “edit” form

Hi, hopefully a simple one. I am looking for an example of how to build a custom “edit” form. The following works perfectly on my site:

[msdyncrm_twig]
{% form entity=”contact” name=”WordPress Example Form” mode=”edit” record=currentrecord %}{% endform %}
[/msdyncrm_twig]

But I need to customise it. I am using a custom “create” form elsewhere, but using similar code I am unable to get it to work in “edit” mode.

[msdyncrm_twig]
{% form entity=”contact” mode=”edit” record=currentrecord required=[“firstname”, “lastname”, “emailaddress1″] %}
<form method=”POST”>
<div class=”newsletter__form–field”>
<label for=”firstname”>First name</label>
<input name=”firstname” required=”” type=”text” />
</div>
{% endform %}
[/msdyncrm_twig]

If I try to access {{ record[‘firstname’].value }}, nothing happens.

Has anyone got any example code for a simple edit form? Thamk you.