Dear Customer,
1. Login to admin panel
2. Go to user manager
3. now select option for user manager
4. here is option for new user account activation
there are three option. Kindly select None and save it.
first is "none" means the newly user registered activate automatically
second is "self" means newly user registered activate his/her account by itself
third one is "admin" means admin activate newly user registered account
And please check the below documentation to enable captcha.
www.cloudaccess.net/joomla-knowledgebase...tcha-joomla-3-0.html Thanks.