Help With commands pls...

Hello guys ive got a question..

i did a programm 2 min. ago...
the buttons and the pic i want are in..
but know:
how can i make that one button changes the digit/or numer of a
command??

like:

If BtJumpOnOff.Enables = true
Then Begin


{................} (put e.g: ju***eigh 800)??

Else If bla bla (to put of and so on...

Im using delphi 7 second edition
if you could help me..!

Note heres a screen: https://img22.imageshack.us/img22/4871/hacktr.jpg
and:
https://img208.imageshack.us/img208/9805/hack2m.jpg

thx in advance