For a “new user” and for this specific problem, I think that upgrading to crimson is NOT the right answer.
The problem with the context menu has been being discussed for several years e.g. Using the context menu in Files/Nautilus - #3 by irvinewade
Much easier is what @FranklyFlawless writes in the previous post.
That would be painful if you had a lot of files to delete but then if you had a lot of files to delete, the command line is your friend.