To open PadKeys Settings, first open PadKeys keyboard in any app, then press and hold the Globe key at the lower left of the keyboard. A small popup should display showing a Gear icon on top. Without lifting your finger, slide it over the gear. Then lift your finger after you have reached there. The PadKeys Settings menu should now display.
Once you have finished making settings, tap 'Done' in the upper right, or simply tap in the background.
We also have a video showing how.