Note: I have created a new local setup for exploring Corteza, so I don’t anticipate any permission issues since the first signup is considered an admin
It does look like a permission issue though. The first user is promoted to super admin, so please check if this is the first user. Following users created in the system have a very restrictive set of permissions by default (so, if no role is assigned to them).
You most likely won’t be able to do it with this user, but in the admin area you can see the roles and users in each role.