Or full screen image: http://abload.de/img/shipping4io22.gif
Use the developers kit by hitting the F12 function key on your keyboard and to go the console tab. Hit the apply button again from the coupon row as you demonstrated and see if there are errors showing on the console tab.
The most generated errors being found on Opencart forum originates from contributed programming. The increased post counters are caused by redundancies of the same solutions that were already provided prior.
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