Turn on Mouse Keys in your operating system settings
Windows: press Alt + Shift + Num Lock, then enable Mouse Keys
Windows: use Settings > Accessibility > Mouse > Mouse keys
Mac: use System Settings > Accessibility > Pointer Control > Mouse Keys
Linux: enable Mouse Keys in Accessibility or Universal Access settings
Use the numeric keypad to move the pointer
Use 8, 2, 4, and 6 to move up, down, left, and right
Use 7, 9, 1, and 3 to move diagonally
Use 5 to click
Use 0 or + to hold and release the mouse button, if supported
Use / to select left click mode, if supported
Use – to select right click mode, if supported
Use . to release a held click, if supported
Adjust pointer speed and acceleration in Mouse Keys settings
Use Tab, Shift + Tab, Enter, and Space to navigate settings and controls
Use keyboard shortcuts for right-click and context menus when needed
Use the laptop function key or embedded numeric keypad if no separate numpad exists