To get a menu for a code-beautifier in Vim by a mouse click

Question

I have never used a mouse click to get a hovering menu in Vim. The following manual suggests such a menu exists.

Here are a few vimrc lines that can help. Put them in your vimrc - -, then you can beautify at least single lines using one mouse click.

nmenu Misc.Beautify.For :s/for\s*(\s*/for ( /<CR>:s/\s*)\s*$/ )/<CR>:s/\(\i\+\)\s*=\s*/\1 = /<CR>:s/\s*\([=<>!]=\\|[<>]\)\s*/ \1 /<CR>:s/\s*\(--\\|++\)/\1/<CR>:s/\s*;\s*/; /g<CR>
nmenu Misc.Beautify.Func :s/\s*)/ )/g<CR>:s/\s*\([(,]\)\s*/\1 /g<CR>:s/(\s\+)/()/g<CR>
nmenu Misc.Beautify.If :s/if\s*(\s*/if ( /<CR>:s/\s*)\s*$/ )/<CR>:silent s/\s*\([=<>!]=\\|[<>]\)\s*/ \1 /<CR>
nmenu Misc.Beautify.Assign :s/\s*\([-+*\/&\|]\?\)\s*=\s*/ \1= /g<CR>

I found onlythe following lines about nmenu in Vim docs. They are not really useful.

   :nmenu Words.Add\ Var         wb"zye:menu! Words.<C-R>z <C-R>z<CR>
   :nmenu Words.Remove\ Var      wb"zye:unmenu! Words.<C-R>z<CR>

It seems that my Vim 7.2 does not have such a hovering menu. The manual suggests to remove the nmenu to get a code-beautifier for many lines. This suggests me that I have misunderstood the action button for the beautifier. It is not apparently only a mouse click.

How can you use the code beautifier in Vim?