How do you make it so your guy can enter another room?
1) Read the manual.
2) Read the BFAQ (http://americangirlscouts.org/agswiki/index.php/Category:AGS_Beginners%27_FAQ)
3) Use descriptive titles.
4) Be more specific - when do you want the character to go to the other room? How do you want it triggered? What have you already tried, and what's wrong with that.
This BFAQ entry (http://americangirlscouts.org/agswiki/index.php/Scripting%2C_Code_%26_Interaction#Placing_your_code:_more_basics) might help. You'll also want the Character.ChangeRoom (http://www.adventuregamestudio.co.uk/manual/Character.ChangeRoom.htm) function, or one of the Interaction Editor room change commands.
First I think you must know all about the room editor, and how the HOTSPOT and REGIONS work with this thing you can make that a character change a room, but as the Moderator saidÃ, you must check de BQFAQ to know more about this.