New to Apple developer so please be patient with me. Why can't I type into the Identifier field in the Certificates, Identifiers & Profiles tab of Apple Developer? How do I get the identifier in that field?
Identifiers can be created automatically (e.g. from Xcode) or manually (on Apple Developer).
The "IDENTIFIER" is the Bundle ID of the app (usually a reverse-domain name style string).
Once an Identifier has been created (on Apple Developer), it's "IDENTIFIER" is fixed, and cannot be edited.
You can only "Remove" it, or change it's "Description", or it's "Capabilities".