Roundcube sett up with Vimbadmin

[petkoo12]

Hello,

i have installed and configurate postfix,dovecot,vimbadmin with this tutorial https://rtcamp.com/tutorials/mail/server/postfix-dovecot-ubuntu/
When i open vimbadmin and i create a new domain and a new alias and choosed send settings to my mail adress i received the settings of vimbadmin, but i can not loggin to roundcube with the name of mail adress and password which i get from vimbadmin.

How can i configure roundcube with username and password which i have created in vimbadmin ?

Please for quick answer