TC settings to use BTMM without making it Double NAT
I am trying to configure my network settings on my TC so that I can use BTMM to access the hard drive on my TC remotely. I keep running into double NAT. I know that I have to change the router mode to DHCP and NAT. Then I enable NAT at PMP. I'm not sure what to do next. Where do I plug my IP address in?
I'd appreciate any help or links to any support that's already out here but I've missed.
MacBook Pro (13-inch Mid 2012), OS X Mavericks (10.9.2)