The Tools multi-function button
offers the following functionality.
Edit Data allows editing/processing the data values and generating new TACs, for instance by averaging TACs or adding noise, see below.
Edit Patient allows changing the demographic patient data as well as the radionuclide, see below.
Save KM file is useful for saving the data as a .km file, if the PKIN tool is opened as an intermediate dialog and hence has no menu available.