The first step is to create a Distribution Provisioning Profile. To do this select Distribution listed under the Provisioning Profile section and then press the plus icon.
From the options listed select App Store and then press Continue.
The next page will present you with a list of App ID's. Look in the list for the App ID you want to use, select it and press Continue.
You will now need to select your previously created Distribution Certificate, then press Continue.
The last stage is to give your certificate a profile name.
Once your certificate has been created it will appear in the list of Provisioning Profiles. Select it and press the Download option.