Open your project on the web page and go to the tab named "People"

Click the "Invite people" button, which you'll find in the bottom right corner. This opens a new window

Either choose a coworker from your list (can't find your coworker? Are they invited to your company?), or write down the e-mail addresses for the people you want to add. You can invite as many people as you want, just click the enter key for each mail you've written to add it. ✔️Pro tip: you can also copy as many e-mail addresses as you want and paste them into the field. The system will only register the email addresses.

Choose between normal and admin access.
-Normal can only create and recieve items, and create reports.
-Admins can do everything in the project, except delete it (only project owners can delete)

When you have chosen roles, click "invite", and a mail will be sent

All e-mail recipients will appear in the pending list, and your coworkers will be added automatically