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I changed the oil in my 2015 civic with the cvt. Manual says 3.6 quarts of hcf-2. When I added oil until it overflowed the check port. Then ran it through the gears and added more oil. I added 4 whole quarts but never got it to come out the check hole again?

any thoughts on why it’s taking more than the published amount?

 
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Are you checking with the car level?

 
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Colin42 made a good point, if your car is not on a leveled place, the amount of oil in the system will not be that much accurate (normally, it is not). To help avoid it (a bit), I just leave all the old oil, including the one from the filter, fall in the oil drain bucket, and then move it to a different bottle (ex.: Tea jugs), where I can ready the amount I need to refill it (if it was good before the change, should be near the same level after). I use the amount from the manual just as a reference to buy the new Qts (4 if I remember - better having a little more for an emergency, than less missing). Remember, a lot of people drain and replace the old oil with the car unleveled while in the jack or jack stands, and that is enough to make a difference. I also like to fill the new filter with clean oil before put it in (in the Civic it is easy since the filter goes almost straight vertical) .

 
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I had the car level on Jack stands

How do I access the transmission filter?

 
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There are many videos on YouTube about changing the Transmission Filter. I am actually going to do it soon. The videos are really well explained, but I would watch 2 or 3 different ones to get different perspectives. Good luck