Similar to enabling a workflow to start from an item menu (in workflow settings) - is there a way to enable to Nintex form to start from the item menu of a sharepoint list? 

I have several different content types on a list and I would like to have one of the content type to be made available on the item menu of a sharepoint list to allow the completion of the data on that content type. When the workflow notifies that group to enter data - that group goes to the item menu on a list and select that Nintex form to fill in the required data.

I know that InfoPath form allows this - wasn't sure how to activate this for Nintex forms.  Thank you.