The conflicts page shows players that are scheduled for two or more events at the same time.
In order for conflicts to appear, all of your pools across all events must be assigned to waves. To learn more on assigning Pools to waves visit the setting up your brackets page and the Waves and Stations page.
If your tournament has conflicts they will appear as such on the "Conflicts" page: Here you can see that Aubfox is scheduled for both Melee singles and 64 singles during the H wave.
There are two ways to resolve these conflicts:
The easiest way is to reseed the individuals that have conflicts by swapping them with someone in another pool. This works best for players that are of equal or similar skill level. To learn more about swapping players from different pools visit the Seeding page.
You can also assign the entire pool to a different wave. Sometimes this can resolve conflicts if multiple conflicts are grouped in one pool.