Z-Script I get it but how do i place screen

Tools>Compile Z-script, then click "Compile!".

Does that place it on the screen i compile it on or just the whole dmap?

Neither.

Compile takes the current buffer of ZScript (a text file you see when you click "edit" in the compiler) and makes it into another language, the Zelda Classic assembly or something like that. You then assign your ffc scripts to ffcs, and put them in the rooms you want the script to execute on. When Link goes on that screen, the script attached to the ffc will execute.

Like for example i put in the wall-hugger code and the monsters will stick to the blocks in the middle?