You can't link it until you receive the acknowledgement of receipt (AOR) email, typically 6-8 weeks after the application was received.This email contains the Unique Client Identifier (UCI) number and the application number (which is shared between sponsor and principal applicant). You're at least 4 weeks away from beng able to link your application online.
In my case, the AOR email came to the principal applicant (me). I assume this is standard.
p.s. just post your message under one topic, not five different ones at the same time - people more likely to help that way