The coda section is usually played at the end of the score. When the rest of the score has been played, there is a to coda marking, that indicate the player has to jump to the coda section. The coda section starts on a new system.
Add a coda marking
You can add the Coda marking by going to the “Measure” toolbar. Select the first measure of the coda section, then click on the coda button. If there is already a Segno in this measure, it will be replaced by the Coda.