What would your planet's albedo be if the planet was entirely covered with forests? or oceans? or ice sheets? Use the "Pick a surface..." menu to cover your planet with common surface types.
Estimates of the precise albedo for a given surface vary substantially in the published literature. Most sources list a range of values, such as 80-95% for fresh snow. Different sources sometimes list different values for a given surface type. For reference, here are some examples: