This is more a tutorial problem as found here.
I am logged in as an administrator, however I am running atrial version of Sitefinity (or at least the final domain of our build has not been registered)
1) I create and activate the module (in the back-end).
2) I go back in to the module to add the content field "City"
3) When I save, I get the (pink-ish) banner error message: "You do not have permissions to change the database".
FYI I have checked all roles and permissions, and have green check marks beside all items (including the modules section)
Thanks for any help
Thank you - that solution fixed the problem.