As I said, you should be able to know the correct steps but I'll help you out.
You need to copy the 6th and 7th number combo, example:
68 00 09 10 29 45 7A00 03 . . . (etc). After that you will need to paste
the 6th and 7th numbers into the "Hex" box and then press the "word" round little box
and then press the "<" button to convert the 6th and 7th number into Decimals.
When you have done that, you will get some numbers on the left box and there you
can change the number into what you want it enchanted for, example:
If you got "1367" and you want a +20 , you would simply add +20 to that number -> 1387.
and after that you convert back to Hex by pressing the ">" button and then get the Hex code and
replace the result into the packet and send to server as I mentioned in the steps. Try it out.