You cannot send an email to all users directly from Athletics.app.
Athletics.app already sends an email to all athletes by default as soon as you move from Phase 1 to Phase 2, athletes will then receive a direct link to their personal timetable and results.
You may be able to send an email to all the email addresses of the athletes yourself via your own email program.
You download the email addresses of all registrants via: 'Registrations' (top of green bar) --> 'Excel download' (right above the table with all athletes).


Then copy the email addresses to your email program and send the email to everyone from there. Please note that email addresses may be duplicated if 1 account has multiple athletes registered!
This has been automatically translated into English