I have a small problem lol

[Tri-Tail]

Uhh this is my first post lol, i signed up about 10 mins ago and i love this site its awesome, i'm still new the the whole RPG Maker 03 thing but i did make a few maps and events the only problem is my characters can walk on everything such as house walls, walk through walls and up cliff faces i'm quite bothered by it and i would like it if someone could help me i've tried numerous  sites but no luck : (    

[Dominicy]

go into the database; go to chipsets; mark things you can't walk on as X, mark things above you (you see them over your head/feet) as a star, and mark for indoor maps the square as the black space between walls and such.