It can be confusing. With a neutral pill in the bottom the settings on the top pill are as follows:
Arrow forward = most caster, neutral camber (top of kingpin tilted back)
Arrow backward = least caster, neutral camber (top of kingpin tilted forward)
Arrow inward = neutral caster, most positive camber (top of kingpin tilted outward)
Arrow outward = neutral caster, most negative camber (top of kingpin tilted inward)
The baseline setting from the factory would be full neutral, meaning a neutral pill top and bottom, or two adjustable pills, one on top and one on bottom with each arrow facing the same direction.