Mapquest html coding

i’m trying to do a link to mapquest driving directions. i’m able to create the url link. but what i want to do is i want to setup the link so that when they click on the link the ending address is already filled out automatically and all they have to do is fill in their street address. here’s an example of what i want:

mapquest has provided the html coding to do this. what i’m having problem is where to place this html coding. can someone please help me?? i’ve looked everywhere and cant find anything on this. i hope all this makes sense!!

thanks in advance!!!