For software versions 6.9 and prior:
Admin and Publish are the two levels of access to a GRIDSMART Processor through the GRIDSMART Client that require a password. Publish or Admin level access is required to Publish. Admin level is required to change passwords and to perform Reset To Factory. The default Admin and Publish passwords are both aldis#world9. These can be changed by selecting Passwords under the Site Settings item of the Site Menu. 
For software versions 19.3 and later:
With 19.3, there are three account-types and all three require matched usernames and passwords. The three account-types are Admin (administrator), Publish, and Aldis (for read-only access). Please see the 19.3 UserGuide for further explanation.

Link to 19.3 User Guide: