This video will show you How to replace and fit a Samsung washing machine door seal, a replacement door seal gasket is not an expensive part on all Samsung Series 5 ecobubble, QuickDrive, direct drive, digital inverter, there are genuine and cheaper pattern gaskets available.
It is recommended to run the calibration after the washing machine seal has been replaced and I recommend doing it every 6 months see another video on this.

The first technique is to actually remove the lid undo the screw that holds the seal to the drum this is called a retaining band. Then remove the outer clip or retaining band this is the one that holds it to the chassis then you will be able to remove the door seal and fit the new one you really need to have some knowledge because fitting the new one this way will be quite difficult.

And if you really want to make life easy you could remove the 2 concrete blocks that obstruct the access to the door seal this will make life very easy on your fingers and also you will be able to fit the seal much better if you are an amateur. sometimes the shortest route is not always the easiest route. it is well worth watching the video to the end as you will see all the techniques that I normally use when replacing the seal especially when you need to line up. the drainage holes at the 6 o'clock position.

it is also worth doing a drum clean