JT, do you understand fully what Roger just posted for you?
Try the suggestions given to you here in a very slow and deliberate way at first and get a feel for the way your body can balance itself, then move progressively from one confidence level to the next.
This media can have many restrictions to it, narrating this-n-that, do this then do this and so on. But, if you piece together each stage of what's being suggested you should have a technique that, sooner or later, settles in to your style and what feels the most comfortable.
Take your time with this and don't rush things. Roger is one of the best at what he does, so take every opportunity to listen and ask questions... lots of questions. Just be mindful that you're only 14, and not a fully matured athlete like those guys playing Major League ball. Those guys in the pro ball also have their learning curves, day in and day out. Pitching is a challenge to be sure.
A final note - as I mentioned earlier, this stuff isn't easy. In fact, pitching a baseball... not tossing it, but pitching, is about as unnatural for the human body as it gets. And if the technique of moving muscles, balancing yourself with each progressive movement, coupled with all these rules that a pitcher can and can not do.... well, it's not for everybody.