I've looked and looked but I can't find a place on "How to Attach a room to a room" You know with the arrows you can buy from Yo depot. Can someone help me here? Or show me where to find the help for that?

From what I can see, you place in the room(s) you want and save...catch is if they were from an event, you can't link it to a matching house you may have.

For attaching rooms:
First purchase two arrows...To find them in your inventory, type teleport. They should come up together. Place one arrow in a room you wish to connect. Then go to another house or room where you want it to connect to. Place the second arrow in that room. Arrows have numbers on them that will pop up in Editor mode. You have to put the same arrow as the other one. This should link your rooms or houses together. If it says they are not linked refresh and try to see if they are linked again. This usually does the trick. No need to move the arrows. Hope this helps you...