you need to copy all the scripts into your game, and then set your enemies according to the definitions of that ABS.
However, using an ABS (Action battle System) script is one of the more complex things to do in RM, and not recommended unless you know the editor and the engine.
If you're new to the RPG Makers, I suggest you follow the link in my signature and work through the tutorials linked there, and play the sample games and the variables guide.
After that, you should have a better idea on how to use the ABS-Script - and if you still have problems with it then, you will be able to phrase specific questions where we could help instead of general ones like above.