Press Shift+F10 or Enter to open the menu, arrow keys to choose, Enter to add.

Right-click or press and hold anywhere

Then point and click, or drag and let go.

Settings

CountHow many actions sit around the ring. Fewer slices are faster to hit without looking.
The ring's radius. Bigger slices are easier to hit with a finger.140px
How far the slices overshoot as they spring out. At 0 they glide into place.50%

ShowIcons alone keep the ring compact; labels help people who are new to it.
Center labelThe hub names the slice you are pointing at, handy with icons only.

Open withRight-click for a mouse or trackpad. A long press works with a finger, a pen or a held mouse button.
How long a press takes to open the menu.400ms
Release to pickKeep holding, drag onto a slice and let go to pick it in one move. Off, the menu stays open until you tap a slice.
HapticsA short buzz when the menu opens, as you move between slices and when you pick, on phones that support it.