Are you looking for the transfer token / EPP code of your domain name registered with Versio? You can use it to transfer the domain name. Read below how to obtain the transfer token / EPP code.
Does it concern a .NL, .COM, .NET, .INFO, .ORG, .BIZ, .EU domain name?
If so, you'll find the token in your customer panel at https://www.versio.uk/customer. Click 'Your domain names' -> 'Overview' on your left. You will be presented with a list of all your active domain names. Click the magnifying glass next to a domain name. On your right you will find the transfer token / EPP code of your domain name.
Does it concern a .BE domain name?
Go to http://dns.be and perform a 'whois' of the domain name. At the bottom, you can then have the EPP code sent to the domain owner.
Does it concern another extension?
If so, contact the helpdesk of Versio.