This first link contains instructions. It’s for installing an armpit overlay, but the process is the same. You don’t need the file unless you want to practice.
Once you understand the basics of that.
then just unpack Tit Kit into a sample directory and use the instructions above for laying down an overlay.
Pretty sure the nip you’re looking for is called ringed 1 blam.
Make sure you make backups of all the files you’re going to edit in case you mess up.
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