In order for you to create a service, simply go to your profile and click on the edit profile button. There, you can scroll down to the Services section and start adding your services.
When creating a service, you need to add a picture, a title, an optional description (highly recommended so users understand what is your service about), a type and a price.
Remember that when you have created a service, you won't be able to edit its price so make sure you carefully select the appropriate amount. You can create as many services as you like.