I submitted my manuscript to a Springer journal and after viewing the submission, I approved it. But now I need to edit one of my references, but the Edit button is not available after approving the submission. How can I edit it? Should I submit a new manuscript?
I think that submitting a new manuscript will just confuse them. The version you submitted will be checked and reviewed. You will get back a report and, hopefully, a request to update and resubmit changes. Make your changes then.
If that isn't enough to satisfy you, then contact the editor of the journal and ask for advice on how to proceed. But what you have discovered is pretty common.
The journal needs, for now, a stable version that can be sent to reviewers. You are just at the beginning of the process and will have time to fix things.
Just wait for the revision cycle to complete and incorporate the change at that time. You are talking about a very small nitpicky change. No reason to disrupt the cycle now.
Note, if they accept the paper without revision, write in at that time to request the change and with an edited version (or a brief email explaining that you will make the change in camera review, if they have that).