You charge the pack to full. Then on the pack, there is an on and off switch. You can have it charge your phone continuously or turn it on when battery is low (~1-30%)and use it to act as a external back up battery and charge your phone. It I quite usefull and I'm sure it will fit the 4s
I know how to put in a folder...
1. Hold all the icons so they wiggle
2. Drag any icon onto another icon so you make a new folder
3. Right when the new folder appears!, drag news stand in fast!!! and I mean do it quick!! Might take a few tries
Hold power for 3 seconds
Continue holding power and press home button and hold all for 10 seconds
Let go of power and continue holding home button for 6 seconds.
Your phone is now in dfu.