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Sorry, you're right, you have the wrong device in my head.
How to set your desired dosage can be found in the user manual under 5.2.2.

The easiest way is to connect the Doser to a PC via USB. On the PC you install the GHL ControlCenter, and then establish a connection to the Doser. There you can adjust everything.
Download:
Doser...

Hallo Tom
Is it a Doser 1 or 2 stand alone?
You need the GHLControlCenter to adjust it. All downloads and manuals can be found here

regards Pit