If you upload the wrong vegetation map or boundary, or choose the wrong Offset Report/Abatement Forecast option then you can correct the error, by clicking on the "back" button in the lower right of the page:

But, once you make a calculation and produce an offsets report or a hypothetical abatement forecast there is no "back" option, instead you must start the whole report process again. This is because the calculation process re-sets things.

If you try and use the back button on the browser itself you may get back to an earlier page on SavBAT 2.1 that has been saved by your browser, but trying to re-use SavBAT 2.1 from this page will generate an error.

For more information on navigating back and forwards on SavBAT 2.1 see page 13 of the the SavBAT 2.1 User Manual.