Pass value in Popup Window

Hi Experts,

I have made the Custom Pop-up with label,text field and OK button.

If I place the new value in text field of Pop-up Window, I need to pass that value to the Main screen of specific field

I have attached the screen shot for reference .

1.

2. New Value is 8.00 ..which i need to place in column Sat ...Can i get an idea for the same..

On Press of OK button...I need to place 8.00 in column Sat

Regards,

Karthik S