Watching Video

[cosmonaut1959]

I am having trouble figuring out how to watch a video and texting like I am suppose to be able to do. I am holding the menu button down and the task manager comes up but I can't seem to get it to do both. Can anyone give me step by step instructions?
Also is there a detailed manual I can get online?
Galaxy S3 4g LTE

 

[cosmonaut1959]

Never mind about the manual I found it.

 

[elwin15208]

Where did you find it? Now I want to learn to do that, too