This is the next thing that you need to do as you sign up. You will want to add new users. I mean you will want to add your colleagues. This is what you need to do now. Please watch this video to see how a new user is created.
Any new user added , his password for the 1st time will be by default email id @1234. So if an user with an email id email@example.com signs up, his system generated email id by default would be, ' firstname.lastname@example.org@1234.
Now when the user first time logs in, the software will force him to change his password. The user will change the password.