You should have a convenience center similar to the one in these photos. There are three hose connections. They should be as described here, but may differ, so due diligence is required.
The top should be city water hookup, the next down should be the connection to draw antifreeze into the system and the bottom one should be the black tank flush. Be sure, initially, to also check that the anti-siphon valve (usually located under the bathroom vanity) is not leaking. If it is broken or leaking, you will not only deliver water to your black tank, you'll also "fill the vanity" with water. It's "clean, fresh" water, but still a "mess to clean up" !!!
Your specific convenience center may differ from this one which are a 2016 Fuzion Chrome model.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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