web2py: how to enable "request_reset_password" function?

I'm new to web2py but eager to learn it fast. I try to enable "request_reset_passwor" function but every time I enter this pa开发者_如何学JAVAge:

http://127.0.0.1:8000/project/default/user/request_reset_password 

I receive message that the function is disabled.

Can you please tell me what should I do and where to get it working?

Thank you in advance.

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I think you need to set up your mail server in db.py first...