How to enter a Skoda Swing radio code

The Swing radio with six station keys under the display, in the Fabia, Octavia, Superb, Yeti and Roomster from about 2009 to 2012.
Type it and every step uses your own digits. It stays on this page.
Switch the ignition on, then the radio. The six keys under the display are station keys 1 to 6. Skoda's manual does not show which is which; on radios like this they run from the left.
Every step
Checked against Skoda's Swing radio manual. It names the keys but not what the display shows while you enter the code, so go by your own display.
If it locks
You get two tries. After the second wrong code the radio locks for about an hour. Leave the radio and the ignition switched on, then you get two more. What each lockout screen means
The radio never asked for a code before?
In its own car the Swing takes its code from the instrument cluster, so a battery change should not bring up the code. If yours asks, switch the ignition on before the radio. If it still asks, the code goes in as above.

