How can I run a macro by inputting a command

if i have a macro named "mm",how can it run by picking a coin or by keyboard input?

-Make a new command.

-Assign the macro to a command and then assigning the command to a toolbar button or to a short cut key

To set up a shortcut key in Acad 2004

1. Right-click any toolbar button. Click Customize.
   
2. In the Customize dialog box, click the Keyboard tab.
   
3. Select a command.
   
4. Place the insertion point in the Press New Shortcut Key text box.
   
5. Press the key combination that you want to assign to the command. If an accelerator key already exists for that command, it will appear in the Current Keys box. If the key combination you specify is already assigned to a different command, the command will appear in the Currently Assigned To box. To see a list of all current accelerator keys, click Show All.
   
6. Click Assign.
   
7. Click OK to close the Customize dialog box and recompile the menu.

how can it run by picking a coin

What do you mean by "picking a coin"?

but how to make a new command and to assign the macro to a command?

but how to make a new command and to assign the macro to a command?

Are you trying to run a LISP file (beginning (defun c:mm (/ ...)) or a Macro beginning ^C^C...?

If it is a LISP file, then just make sure that the LISP file is loaded (either in Startup Suite or ACADDOC.lsp), and just follow the above for customising a button, and in the box where it says "Macro", just type the syntax that appears after (defun c:...)