How do I enable NAT to use "back to my mac" on iCloud?

I get an error message when trying to set up :back to my mac" which tells me to enaable NAT and to refer to my router manual. I tried Tech Support of the router and they told me to contact Apple. Any ideas anyone?

Check your router for a setting labelled UPnP or NAT-PMP. Enable it and that should solve your problem.

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