Reports are located in the Analyze tab.  To print a report, click the print view link to see the report in printable format.  (The print view link is at the far right of the header, just above the next report button.)    

The Remaining Trend Report (a.k.a. Burndown Report)

The Remaining Trend report shows the estimated remaining work over time, plus a projection to the probable landing zone.

The upper blue line is the worst-case (high) estimate of the remaining work. 

The lower blue line is the best-case (low) estimate of the remaining work.

The black line in the middle is the expected value of the remaining work.  

A healthy project will show remaining work that narrows continuously and slopes smoothly downwards as work progresses. If the black line creeps upwards, this is a sign of either scope-creep or consistent underestimation of tasks. If it jumps downward then this is can be a sign of cutting scope to meet deadlines.