Can someone pls teach me how to run i have tried the videos on youtube but i just keep getting flung in the air if someone could pls post how to i will be happy

If you are getting flung in the air you probably haven't set the gravity to -30.00
To do so go to setup, then game rules then in the gravity settings, set it to 0.00 0.00 -30.00

No one here is going to give you a step by step guide. Youtube is the best you'll get. I remember I used a Youtube tutorial when I was trying to learn to run and they worked for me. You must be doing something wrong.
Eventually I decided that taking techniques off others is kinda silly so I just slaved away in single player till I got it.

Follow this tutorial:

Make sure to set the gravity to -30 or I guarantee you will fail.

Heres a good example of some running with an awesome ending.