And....
To create a variable, please click on the yellow X at the top of your trigger editor window.
another window will open up allowing you to creat a name for your trigger. It can be any you want. However you can not use spaces and certain characters. That is why when ever you read posts and you see names like "Dog_Summer", "Dead_Winter" "Red_Hero" they have the underscore (__) between words.
The second option of the variable creator is Type. In this case you need scroll down to Timer.
Once you have created you variable you set it using the Set Variable Function.
Thank you and enjoy your experience with World Editor.