To ensure your queries relating to the Peer Review System, the submission process and manuscripts under review reach the appropriate contact as quickly as possible use the "Contact the journal" option on the relevant journal's website.
A journal's submission interface can be accessed by going to the journal overview page on Springer Nature Link and navigating to the relevant journal's homepage. Click on the "Contact the journal" option in the right hand column.
You can find more information on how to become a peer reviewer for Springer Nature here: How to be considered as a peer reviewer at Springer Nature, and if you're looking for how the peer reviewing process, along with helpful tips for giving a good peer review, please read: How to peer review at Springer Nature.