jabrister wrote: What is user parameters (PARAMS) used for in CB Field Manager?
As explained in your Detailed CB Documentation (you can download it from the Advanced download area) in Chapter 6.1:
• Name: params, Title: User Parameters, Type: userparams, Tab: Contact Info
This predefined field is used to group the various CMS parameters that a user can set. E.g., language setting, locale, etc.
This predefined field is used by CB to link back to the Joomla CMS parameters like Language, timezone, etc.
You should not tamper with this field.
There is also a CB Configuration -> User profile tab setting (also explained in your documentation):
Allow user to edit his CMS parameters in frontend: