I need to upload an app. I have built to the app store. I’ve been following the walkthroughs and have got stuck on the bit when i download the distribution certificate.

my provisioning profile is listed under the provisioning profile column, ive just blanked it out. when i download the certificate, i double click it, keychain access opens and my certificate is listed in the ‘certificates’ tab, but not the ‘my certificates’ tab with no dropdown to show a private key has been created. Is there something Im missing? ive been through 4 different walkthroughs all saying i need to just double click the certificate.
Thanks in advance for any help.
Judging by the Expiration Date this certificate was created a while ago.
If you are using a different computer, or simply do not have the private key saved for any reason you will not be able to use this certificate. Basically, you have 2 options: