You need to contact PACER to activate it if you cannot wait the 7-10 days for activation to come in the mail.

Although your PACER account is not activated you can still create the link with your CM/ECF account and be able to e-file.  You just will not be able to view documents using PACER until your account has been activated by PACER. If you have a firm account for viewing documents, you can use that in the meantime.