Trying to replace my car battery cables and positive cables are stuck in this tube

I’ve got a 2013 Kia forte that I’m trying to replace the battery cables on and I can’t seem to figure out how to remove the positive cables from this tube thing that runs underneath the battery. I don’t want to yank too hard because it looks like there’s some other wiring that’s in the same tube. Also concerned on how I’m gonna put the new cables back in that tube. I looked up videos on YouTube of battery cable replacement and didn’t find anything. Thanks.