To register your account for SDS Deployment Support you have two options:

On the left, you may create a local account by providing an Email and Password you would like to use for the site.

Alternatively on the right, if you have valid Office 365 credentials you may use those to create your account. Click on the Azure AD button to be prompted for and use those instead.

Register for SDS Deployment Support by creating a new local account
Register for SDS Deployment Support by using your Office 365 credentials