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The usual hot keys work in the editor:
Shift + arrow for select
Ctrl + C for copy
Ctrl + X for cut
Ctrl + V for insert
Ctrl + Z for undo
Ctrl + Y for repeat
Of course you can also select with the mouse and use your browser's editing features.
Linux / X11: A left doubleclick selects and copies a word, and a click on the middle mouse key is insert.