mapleader question

I don't understand most of this help doc pasted below.

If I have a map <Leader> instead of \ how do I execute the map?

If I have \A

I would just type those characters. What do I type for <Leader> ?

*<Leader>* *mapleader*
To define a mapping which uses the "mapleader" variable, the special string
"<Leader>" can be used. It is replaced with the string value of "mapleader".
If "mapleader" is not set or empty, a backslash is used instead. Example: >
:map <Leader>A oanother line<Esc>
Works like: >
:map \A oanother line<Esc>
But after: >
:let mapleader = ","
It works like: >
:map ,A oanother line<Esc>

Note that the value of "mapleader" is used at the moment the mapping is
defined. Changing "mapleader" after that has no effect for already defined
mappings.

Thanks

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