Welcome to Android Central! If you're using your fast charger, it's a system message telling you that the phone is fast charging (as opposed to charging at a slower "normal" rate, which would be the case if you were using a charger that wasn't capable of fast-charging). There's no way to get rid of that message.
The first screen you're seeing is probably the initial swipe-to-unlock screen that gets you to your main unlock screen (with password/pattern/PIN entry). Some phones allow you to turn off that first swipe screen, others don't. So it's important, as Tech-Newb asked, to know what phone you have.