Applies to Internal DAC only (Wired Headset/AUX in Poweramp output settings).
Please post your device (with optional ROM/Android version) if Poweramp alpha Hi-Res audio works for it.
If it doesn't work, check this thread:
What audio info screen? The tags/info display can be found via the Menu in the Player screen, or long-press on a song title in the library. The Equaliser is found by pressing the EQ button near the top of the player screen, or via swiping in from the right edge.