Anubis13, open Construct 2 and go to [File] -> [New].
In the search field at the top, type number 8.
You'll find 8 direction behavior examples.
Open the first example '8 direction behavior part 1' and click 'Run layout' button located at the top.
You'll see the player moves when you use the keyboard move keys.
Under [Projects] -> [Object Types], find an object called [Player].
Click [Player] and you'll find the [Player] has a behavior called [8direction].
Go down and click [Behaviors] located next to [Add/Edit].
That's where we add behaviors.
Please visit [How do I...?] forum by clicking the link below, for the assistance, as there are a lot of people willing to help new users.