How to mass send out welcome emails
The quickest way to do this currently is by clicking settings in the top right and then going to mass edit, in here is a toggle for password that you will want to turn on and then press the search button in the bottom left.

This will then bring up a box next to each employees name with three buttons underneath. You will want to press generate, save and then send welcome email in that order.

This will then generate the user a generic password and then send them the welcome email with their log in details and link to the portal to log in.