Is there a way to connect the civisepa backend to the profiling in wordpress?
Welcome to CiviCRM Stack Exchange alicedd!

Afaik, CiviSEPA mandate information cannot easily be made available in Profiles. CiviSEPA can be made available as a payment processor on CiviCRM Contribution pages though. CiviSEPA would then create a mandate when someone uses the page

If you want to allow constituents updating a mandate you will need to create a custom form / function.