How do I configure which fields are required in registration page? I want to remove "First Name" and "Last Name" fields from registration page. How to achieve this?

The USER CREDENTIAL fields are all required -- the associated columns in the database have a "NOT NULL" restriction.  However, only the USERNAME and possibly (depending on your host/portal settings) EMAIL must be unique.  Therefore you could hide the entry boxes and "auto-fill" some default value in the other fields.  You'll still have to figure out a means to do this, though. 

Also note that the FIRSTNAME and LASTNAME fields from USER CREDENTIALS are synchronized with the FIRSTNAME and LASTNAME fields under USER PROFILE.  The two sets of fields are stored in different places in the DB but DNN code logic keeps them in synch when using DNN methods to perform updates.

If it helps...
The most versatile registration module I've seen to date is Dynamic Registration from Data Springs.

-mamlin

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esmamlin atxgeek.me