You need to register on SEDI as a SEDI user only if you need to file something on SEDI. You do not need to register if you simply want to search for information on the SEDI website.
You must be an individual to register on SEDI as a SEDI user. An issuer that has information to file either as a reporting insider or as an issuer must do so through an individual who is registered as the issuer’s representative or agent.