Land is considererd an investment. You will include this as a sale of an asset. As land is not depreciable, you probably didn't have an Asset Entry Worksheet for it which is required to note the sale.
So click
1. Open a Form (under Forms) and create one, (or do it under the Depreciation interview - see topic list).
2. Then fill out the disposition section at the bottom.
In the interview , the Depreciable Asset Sale section (Topic List) would probably work OK too (with zero depreciation).