I know the form ID and I need to edit it, how to find it

Someone created a marketo form and embedded it on our website: the code looks like this:

<form id="mktoForm_542"></form> <script src="//app-sj04.marketo.com/js/forms2/js/forms2.min.js"></script> <script>MktoForms2.loadForm("//app-sj04.marketo.com", "541-JCA-443", 542);</script> </div>

When I log into marketo using that account, I am expecting to see an option like 'list forms' which will bring me to a list of all forms with their ID, so I can locate form 542 and add and modify fields.

However, I see only:

• Marketing Activities
• Design Studio
• Database
• Analytics
• Email Insights
• Community
• SEO
• Marketo Sky

I do not see "List Forms". How to access all my forms so I can edit form 542?