With Sirena, you can log in with your Google or Facebook account. To do this, the user must have the e-mail used in his Gmail or on his Facebook account registered with Sirena. To see and edit the e-mails of each user go to Groups&User.
In order for the user to be able to log in this way, they must go to web.sirena.app and select "Login with Google" or "Login with Facebook":
The first time you must grant access permissions from Google or Facebook.
In the event that you wish to block access to the account, all you have to do is unsubscribe from the Gmail email registered in Sirena.