Is there a way to enable two-step verification?
If so, how could I do this?
If not, I'd like to suggest this feature.
What do you mean saying "two-step verification"?
A system like Authy, a way to protect users' forum accounts being stolen.
This requires a user to verify himself by using an external method, like an email account, or an app on their mobile device.
wpForo uses WordPress user and login system, they are fully integrated, so you can use WordPress 2FA solutions. Examples https://wordpress.org/plugins/tags/2-factor-authentication