Lasercad & awc608 plus help

hi all first time poster but long time reader, i just purchased a 100w machine that was fitted out with a sinjoe awc608c plus controller.
now i am having issues with setting up the origins and home i think as everytime i try to cut i am getting a message "beyong size continue ?" or engrave beyond size" continue message.
i have tried as much as i could and i have read plenty on here but no success.
can someone please shed some light.
thanks in advance ........
also im using coreldraw 17 if thats of any help

I know how to open the bed size its in manufacturer parameters. Im having a problem with my bed size to. I dont know how to set the size so my laser stoos whrn it returns to home