The table view in your screenshot would be a place you can edit your records, are you not able to type in the fields to change the values there?
Although to be warned, changing any value in the "id" column would seriously damange your data, so I would not even have that on the layout.
If you can't type in the fields, chances are you need to modify the fields in layout mode, Under the inspector there is a checkbox under a subheading that says "allow editing of field values", it's in the data tab. The checkbox for "browse mode" needs to be checked in order to edit data.
It could also depend on your user privileges.
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