There are two ways participants can opt-in to text/email notification tracking for an athlete. If you are only using RunSignUp for results then option one will not apply to you. 
  1. A registrant can enter in this information during the registrations process (assuming that this Race has notifications enabled under Go Race Day > Results > Setup Results Notifications and Links > Allow participants to sign up for text message and E-mail notifications of results.) 
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  2. Anyone can register for notification tracking for an athlete by looking up the participant on the Find a Participant tab of the Race's RunSignUp page. There is a link in RD for this under Tailor > Options > Partner Setup > Notifications SignUp when the Enable Notifications feature is checked. 
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Most timers will send out an email a week or so before the race to remind users to sign up for athlete tracking. You can check on the status of your notification registration on the RunSignup Race Dashboard under Go Race Day > Results > Results Notification Reports.

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Please note that someone who is looking to track an athlete can enter in whatever email/phone number that they like when registering for. This is nice and easily allows for participants to enter in the information for others who would like to receive notifications of their finish/progress like friends and family members.