Thank you for your inquiry.
You can do this by going to Configuration / Processors in your space and click on the desired processor you want to activate. There is an option called Operation Mode where you can change the processor to Live Mode
Afterwards you will have to provide the necessary authentication details in order to ensure a connection between the payment service provider and your shop.
To find more information on how to insert this data please click here: https://app-wallee.com/en-gb/doc/api/processor/list
On this site you can choose your processor and click on the book icon in order to see its documentation.
Let us know if you need any assistance with this.