You can tick/untick that option anytime later.
In ReaMenus go to:
Options|Menus/Toolbars... and in the "Customize menus/toolbars" window you can select it at the top (Include default menu as submenu).
If you want to go back to the default menus, click the "Reset" button at the bottom. "Reset all menus to defaults" will do that for you.
HTH
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