Enter the name of your mailbox and give Continue (our mailbox is firstname.lastname@example.org – but you enter yours here)
The difference in protocols is described here: POP3 or IMAP?
instead of the mailbox email@example.com, fill in your mailbox name + password.
Enter the server (host) name: mail.blueboard.cz
For incoming IMAP mail, set the port to 143 or the secure port to 993 But if you initially selected POP3 for incoming mail, set the port to 110 or 995
For SMTP (outgoing mail) you set the port to 465