You want to get access to the Package Share with your day.com userid.
On the welcome screen at
http://<host>:<port> click to item Packages and then Package Share
On the login screen you have to click to Register here.
You get redirected to the registration form. Please fill it out completely and click on Submit to sign in.
You will get a confirmation email after a while...
Note: Please also have a look to the corresponding section in our docs...