This video show how to use Dynamic Input in AutoCAD.
Before using this drawing aid, make sure that you have Dynamic Input turned on. Toggle it on and off using the F12 key.
You may find it easier with it on or you may find that Dynamic Input clutters the screen. It's up to you to decide if you want to use it.
It is also a way to ruin your drawing by having sloppy habits. You need to be care and pay attention when using these tools. Use this tool in conjunction with Direct Distance Entry to speed up your CAD work.