If you have a few assets, I believe the general thought is to enter them into ProSeries. If you have a bunch of assets or you just want more flexibility in handling the assets, go with the Fixed Asset Manager.
Have you purchased the Fixed Asset Manager? I think that is a separate thing to purchase.
From what I can tell, if you just need to keep track of assets for income tax purposes, ProSeries is what most people use.
If you need to keep track of asset for other purposes (weird state income taxes, state taxes on value of personal property, accounting/non-tax depreciation that differs from tax depreciation, etc.), then the Fixed Asset Manager will give you more options.