In Numbers 6.2.1 (mac os) how do I set up the "merge cells" keyboard shortcut?

Question

macOS

I'm editing tables in Numbers on a macbook, I especially need to merge cells.
But I can not find a combination of keys to perform this function or assign my own.
How to assign your own keyboard shortcuts?
PS
I know how to use search engines, but so far no luck.
I saw the same question on habr, but the answer to it is no longer relevant.
Yes, I copied the text of the previous speaker.

Answer 1

add in system settings:
press +
select Numbers
in Menu Title select Merge Cells
in Keyboard Shortcut press desired hotkey (I have ctrl+m)

Answer 2

Thanks to! Works!
One clarification, I have a system in Russian.
In the "Menu Name" to make it work, I entered "Merge Cells" in Russian.
upd.
Made a second shortcut for "Merge All Cells"