Go to the official Danish admissions portal optagelse.dk to apply. If you are applying through an agent read more here.
You can sign in using NemID if you have a Danish CPR number or log in using an email address if you do not have one. On the portal, you will find complete instructions on how to fill in the application form, upload attachments, etc.
Once you have applied in the Danish admissions portal, you will be able to follow the progress of your application in VIA's own portal here, as well as receive and send messages from/to VIA about your application.
You will receive a notification via email, if you have new messages from VIA in NemStudie. Your official acceptance letter will also be sent through NemStudie. It is your responsibility as an applicant to keep yourself informed on your application through VIA's portal.