Clouds on how to submit code webide

After modification would like to submit, it will prompt: "After the staging file in order to submit"

 

 

I take a magnifying glass searched the interface did not find "staging" button,

It turned out that the + sign next to the file is temporarily stored, and then whatever the outcome mouse way to give a tip, she served.

 

Tap the plus sign, you can use the submit button.