Visit https://ap.easa.europa.eu/ for information about the EASA Applicant Portal.
The EASA Applicant Portal Registration Form and the additional mandatory documents should be sent by regular mail to:
European Aviation Safety Agency
Applications Handling Department
REF: Applicant Portal Registration
Postfach 10 12 53
Email: Applicant [dot] Portal [at] easa [dot] europa [dot] eu