The Witcher sheet : question about ability modifiers

Hi every one With the current situation i am trying to put my witcher campaign on roll20 and i am currently having a fair battle with the character sheet. I do not understand the use of this box : ability modifiers (if i translate correctly). I get weird results that do not match my player's paper sheet.  Can someone please explain this to me :) I will be very grateful. Thank you

Hi, follow the instructions on the Note, you need to manually modify the "HP Actual" number and then the sheet will begin to work properly. The "Ability modifier" box is for temporary variations of the stats during the game, so at the beginning it needs to be all at 0

Thank you ! It works ! :D