Set it to a spin or drain programme, if it doesn't drain you'll need to drain it manually.
There should be a thin tube beside the filter to drain it down.
Once drained down the door should open and you can also take the filter out and clear out the debris stopping the machine from draining.
Let me know how you get on.
Hope this helps
The thin tube should be the drain.
The big cap is the filter, once the water is out you need to get that cap unscrewed and out to clear out the filter.
If you prefer you can drop the drain hose into a bucket and do the majority of the water drain quicker.
Sorry, it is the drain hose but instead of a plug you have to turn the filter cap anticlockwise 2 or 3 times.
I've attached the link to the user manual for you, page 22 explains how the tube works.
Click here for the manual
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Glad to have helped.