On the main menu in Word, go to View | Toolbars, then select "Control
Toolbox" from the pop-up list (click so checkmark shows in front of it).

This will display the Control Toolbox toolbar in Word. Clicking on the
Command Button button on the toolbar will create a Command Button at the
current insertion point (where your cursor is in the document).

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You could use a macro button field:

Do CTRL-F9 to insert a pair of field delimiters: {}

Then type something like this between the delimiters:

{MACROBUTTON name_of_your_macro Text to be displayed in document}

Finally, with the field selected, do SHIFT-F9 to toggle between field code
and field values.

The user need to double-click on the MacroButton field to launch the macro.

You could use an ActiveX button (from the Control Toolbox toolbar), but if
you plan on distributing your work, you may run in all kinds of problems
with macro security (ActiveX controls are blocked by the security system).