If you get a text and it shows a small rectangular box showing who sent the message and a few of the words from the text, you simply touch that box and then a larger sort of grey box appears on the bottom of the screen. Place your finger on that box and swipe across. It will bring you directly to the text message.
As for adding programs on the lock screen- open your lock screen and place your finger on the far top left of the screen and swipe to the right. You will see a plus(+) button. Hit that button and it will give you a list of apps/widgets you can load onto theses screens to be able to use without unlocking your phone. It is a little tricky and if you swipe to the left from the lock screen it will take you right to the camera.
I don't find these app/widgets as useful on TouchWiz as I did on other ROMS I have used with my last phone.
Good Luck!