For this tutorial I used Construct 2 r178 free-edition
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
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:
Here is what it will look like when it's done:
I hope I did OK since this is my first tutorial. Please let me know if you have any suggestions or questions.