Adding competences starts in Configuration/Competences. There, using the "Add a competence" button, you will be redirected to a page that allows you to create a competence.
First of all, you need to name the competence and choose if it's a soft or a hard one. With a soft competence you have to decide if it's gonna be graded manually or by an average value of behaviors that define the competence.
You can also decide if this competence is going to be measured with default scale or if you want to use your own.
When the competence is added and if it's a soft one, you have to define behaviors. Just go to the "Behaviors" tab and click on "Add a behavior" button.
Behaviors are being defined exactly the same way as competences - you name them and choose a scale - default one or your own.