If you are a technical, billing, abuse or general contact, you will be asked to request a BPKI certificate by clicking on the "Request BPKI certificate" button.
Your request will be sent to all the Administrative contacts of your organisation. Only if the admin contact already has a valid BPKI certificate, the system will grant him access to accept the BPKI request made by non-admin contacts of the organisation. If this is not the case, ask the admin contact to proceed as instructed here.