changing search sortcut to ctrl/f

[sting sting]

Hello,
I want to change
mcedit keyboard shortcut for search  so it wil be ctrl/f and not F7.

I tried to do it with learn keys :
I pressed space on F7, then enter ctrl/f .

When pressing again ctrl/f it doesn't show OK.

When I try in mcedit ctrl/f , it opens a search box  (with no place to enter 
text) and says:
"Search String not found" (as if it did performed a search on something, 
though it did not
even gave me the chance to enter any text).

Any idea what shold I do ?

Regards,
Sting

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