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How to save and close an editor in IntelliJ IDEA during a merge commit?

I try to type a message and press Enter but nothing happens.

I tried this, but it’s not working:
i: insert just before the cursor
I: move to beginning of line and (i)nsert
a: append just after the cursor
A: move to end of line and (a)ppend
o: open a new line just below the current line
O: open a new line just above the current line
R: enter REPLACE mode (similar to INSERT mode)
q – if you haven’t made any modifications, or saved them beforehand
q! – ignores any modifications and quit
wq – save and quit
x – this is similar to wq

AND this

press i (i for insert)
write your merge message
press esc (escape)
write :wq (write & quit)
then press enter