Your enablement manager should actually be the person who works AT Marketo who helped you/your team with your initial set up of Marketo/Marketo Sales Insight. If it's been awhile since your original set up, you can always just submit a case and they can probably get you the password you need.
In the past it was a general password that everyone used, but I can't recall if that changed or not, so Marketo Support is your best bet. Hope this helps!