History Tab
The History tab is where all non-loot-related entries go to die. In the tab, you'll see a list of entries that by default are all collapsed. You can expand all entries by clicking the "Expand All" icon above the scroll bar, or you can expand a single entry, by clicking its expand button towards the top right of the entry. When an entry is collapsed, it will show an abridged version of the entry description, denoting which Officer made the entry, and what the reason was.
To view a particular member's DKP History (minus loot), simply select them in the member's table, and the addon will only show you DKP entries that pertain to that particular player.
You can select the members from a previous entry by navigating to its corresponding tab, expanding it, and shift-clicking in the member's section of the entry. This will automatically select everyone in your Members Table who was previously in that entry.