I have a 32cc crasftzman weed wacker need how to

This can be a little tricky, the filter is in the tank connected to the line. The line is pulled through a hole in the tank which seals only because the line is the correct outter diameter to seal the hole and not collapse the interior. Fuel line and filters are available at most places that carry outdoor power equipment parts but you must make sure the line is the exact size inner and outter as the original.
If the trimmer has a primer bulb the line goes from the tank to the bulb and then to the carburetor, a second line goes from the carburetor back to the tank, don't get them mixed up.