if you want to do it for the marine it is simple go to the stimpack ability then inside the commands array click execute then you will see a section called requirements click the little red at the bottom right side of that section to remove the requirement.
if its not the marine then it's the same just you also have to give the unit the ability. which is just under the unit you want to give it to double click the abilities array add the ability stimpack. then hit ok then go into command card array click where you want your button then add a button of your choosing and in the pull down menus you will find your stimpack ability just make sure its set to that and you are done.
if you want to do it for the marine it is simple go to the stimpack ability then inside the commands array click execute then you will see a section called requirements click the little red at the bottom right side of that section to remove the requirement.
if its not the marine then it's the same just you also have to give the unit the ability. which is just under the unit you want to give it to double click the abilities array add the ability stimpack. then hit ok then go into command card array click where you want your button then add a button of your choosing and in the pull down menus you will find your stimpack ability just make sure its set to that and you are done.
oh an Requirements and Other tutorials ;) sorry couldn't resist
damn got beat by half a second cause i wanted to add tutorials oh well