I jus wondered where i enter the codes for layouts - frontpage & entry page. Thanks/

You put the code where you type your entry or things on your frontpage :)
Usually somewhere in the code you get it'll say 'TEXT HERE' or something to that effect.

If you want to have it so it always shows up for every entry, go to Manage my Diary > Click Entries at the top > Click Entry Template (you can change it whenever you'd like :))