Welcome to the community @lazasoa! At the moment, users are able to view the data they have submitted in the KoBoToolbox server if you provide the user with row level permissions as outlined in the support article Row-Level Permissions. For further understanding you could also have a look at our support article Managing Permissions.
But unfortunately, please be informed that users at the moment are not able to edit the submissions from row-level permission. Here is a feature request post for the same:
Maybe you could VOTE for the same to see this feature in the future.
