Question for experts, I am new to the WPFORO software and setup, but recently had it installed for my site.

Currently, a new user comes alongs, registers for the site, gets an email to set their password and then can immediately start posting on the forum- or in my case- start spamming it.

How can I make it so that every new person that registers for my site has to be approved by me to either have the account activated, or to start posting? Also, how can I ensure that bots/spammers can not defeat the anti spam challenge? Any help is much appreciated thanks