I finally manage to link the application: Below is the steps that I followed:
- Select Application number and UCI (Parents UCI)
- Select City and Country of Birth (Parents)
- The applicant intends to live in Canada: Province, City, and Current Marital status: Parents
- The number of family members, including the primary applicant, that are part of this application: Sponsor + Cosigner (if applicable) no kids +PA (+Dep if applicable)