Unlike the engine oil filter, you will re-use the MTF strainer (filter) once you have inspected and cleaned it so don’t throw it away.
Strainer cover looks like this and you just need to replace the O-ring after removing the cover. You will see above parts inside the cover. The O-ring is located at the cover.
If you have never done this before, it would be best to get hold of spare strainer cover in case you have damaged it.