If you cannot see the extension it is either because the files haven’t been installed in the correct location, the cache has not been refreshed, or you haven’t re-compiled.
You should have files or folders titled WebShopApps under
app/code/community. If you do not have these files or folders, you haven’t installed the extension correctly. If you have these files or folders but you still can’t see the admin options, disable your cache, refresh the front end, log out of admin, login and try again.
Make sure you can see the extension under
System->Configuration->Advanced. If you cannot see the extension, it has not been installed within the site.