J.P. Instruments EDM 960 Twin Pilots Guide - Manual (Page 56)

For Your Safe Flight Page 51
9. Tap/hold STEP to select the cell you want to edit. Tap EDIT to
change the value. Tap SAVE to record it. Follow the on-screen
menus to edit the value. Keep tapping DIGIT to move it across.
10. Repeat previous step until all tanks data have been entered.
11. You see ‘Save fuel tank data?’. Answer SAVE to store all final
data values or CANCEL to return to table editing.