I have installed Ad mod: 2.3 ........... insatlled succesfully but its not working in my website and my theme is crop lt and the smf version is 1.1.5
plz help me to get out this confusion
You'll be needing to edit the theme you're using by editing the core templates via FTP. How do I use FTP? / What is FTP? (http://docs.simplemachines.org/index.php?topic=480)
The location of the files is %root%/%smf_root%/Themes/*name of theme*/
You can find manual modification instructions on that modification's thread and/or use the parser built in on the mod display.