Currently for registering to the site, you must use Discord Login Feature on the login/register page.
After accepting the Permissions for Discord in the "Oauth Screen", you are redirected to the site. You will automatically join the communities you are also member of on Discord, and will be verified automatically.
In case you are not part of any participating Discord community, your account will not be verified.
For login in to the service again, you must use the Discord login via the login/register page again.