[HowTo] Password Changer Roundcube 0.3 Stable

[sfera]

Hello.

I have a little big problem hehehe

I'm use the manual and i get some errors.

First I supose I need create the dns (cube.domain.tld)
Is correct?

The second when I logged in the Roundcube Instantaly I get the next error : "Error in the server! (not found) and i get logout from the webmail. I attach a screenshot from the error.

Any idea

Thx in advanced