You can resend the Welcome Email, which includes the login details, through the Email Management section. Follow the steps below:
Go to Administration > Email Management > Manual Emails.
From the Email Template dropdown, select Welcome Email.
Click on Show User(s) to display the list of available users.
Select the user(s) you wish to send the email to.
Click on the Apply button.
(Optional) To include additional recipients in CC, select a user level or enter specific email addresses in the CC field.
Click on the Send Email button to resend the welcome message.