Where is referral ID?

Excuse me, I'm a bit confused about something. Could you please help me locate the referral ID? I'm trying to sign up for this cryptocurrency platform, but I can't seem to find the referral ID box or section anywhere on the sign-up page. Is it supposed to be somewhere specific, or do I need to get it from someone who's already a member? Any guidance you can provide would be greatly appreciated. Thank you.