Roundcube login message - help with redisign

[prubi]

Hello ive installed roundcube for my costumers on www.posta.rubin1.si, i am using the icloud skin, which i bought on roundcubeplus.com.
I wanna show a message and a copyright message like on this roundcube installation: https://webmail.t-2.net/

How can i add this message?
And oooh this installation of roudncube (webmail.t-2.net) is using the same skin like me (the icloud skin), i opened a ticket where i bought the skin and the stuff said they dont know how to add this messages to the login screen.
So I hope you, the community has a solution to my question.....

P.S.: Screenshots added.

[JohnDoh]

see https://www.roundcubeforum.net/index.php/topic,28760.msg73386.html#msg73386