When your company administrator invites new users, the users will receive an email sent to the email address that the company administrator enters into RunMags.
Look in your inbox for an email from the RunMags Team.
The email should look like this:
Click the Activation link in green color which will open up a screen where you can create a secure password.
Later on, if you have a Google account setup for the email address, you can sign in with Google. That way you don't need to remember a password.