could not complete your request because the smart object is not directly editable
Well, I am trying to simple remove a background but photoshop doesnt let me do it. it comes up with the error:
could not complete your request because the smart object is not directly editable
I read on the internet saying that I should "rastize" my layer. I googled rastize, but I could not find a good answer what rastize is. Also, I tried translating rastize into my own language, but it says rastize also. However my photoshop is in dutch. I could not find the option "rastize". What should i do? below is a screenshot:

