The pins are called “DuPont connectors” - you’d want to chop the LED-side and use a 3 pin female DuPont instead of a 2 pin. If this is something you think you’ll do more than once, I’d buy a crimper on Amazon or wherever (they’re ~$25 last time I checked). But, you could also pull the two wires out of the connector and keep the crimps on them, and then just stick them into the DuPont plastic shell which would avoid needing a new pair of crimpers. To remove them, there’s usually a little tiny plastic tab on one side for each contact that you can pry up with a little tiny screwdriver.