If you select a value from the quick box it should be placed inside the currently selected edit box. If the the edit box is a numeric value you can chose to add or subtract the quick box value from the currently selected edit box. You have probably noticed the little check boxes next to the numeric valued edit boxes. Well if you select any of those check boxes and the use the quick box , all of the selected edit boxes will be changed accordingly. The above opperration is the best way to change the magnitude of movement items.
First way is to simply raload the unit.
You could use the Quick Restore button. This is only avalible if you have actuly made a change using an edit box and then quick saved it. This pulls the info back out of the current edit buffer. This may lead to some funny qiuck item values now and then. You may have the original value in the description window.