For this tutorial I used Construct 2 r178 free-edition
Step 1
Go to New - A dialog box will open up showing you a list of templates you can choose from
Select "Template : Platformer" - which is the one I used for this tutorial, but you can choose any template you want or start from scratch the choice is yours.
After your selection the project will open up
Step 2
Go to "Event sheet 1"
There you will see the following
At the bottom you will see where it says "Add event" - click it
Then you start adding the following events and you should be done:
Preview
Here is what it will look like when it's done:
Feedback
I hope I did OK since this is my first tutorial. Please let me know if you have any suggestions or questions.