For any contact please use our Customer Portal:
https://lumo.atlassian.net/servicedesk/customer/portal/3/group/5/create/20
It helps us to keep all requests organized and in one place
If you like you can use email, which will also result in creating a new ticket: support@lumo.atlassian.net
(This is one of the JSM features, if you want to know how it works check : <link to article>