how do i find serial number for jjos 4.99

hi all, just bought my FIRST EVER MPC 1000. i had to buy second hand thou. it came it jjos 4.99 but how do i find the serial code so i can pay for the upgrade?
many thanks

in the save screen

where abouts? i got load,save,usb,new and do it. is thier a short hand to get serial number or something?

sorry if this offends experts

should be in the save screen. if you can save and a prompt doesn't apppear, your mpc already has the password installed

yep save all good. sorry if this frustrates you but what i mean is when i go to get the upgraded jjos i thought i needed my password to get the new one?

download os2 , stick it on your cf card and install it. when you try and save in os2, the save screen will give you another code number.

if its a more recent os1 you want to install (4.99i is the most recent), ignore the above and just install it.