Splinterlands allows players in Bronze 3 and above to earn rewards chests by playing ranked battles. Focus (=Daily) Rewards allow you to earn chests every 24 hours. Season rewards can be earned at the end of every season.
Each Focus Quest will end after 24 hours. After that, your rewards chests will be able to be claimed. Just above the timer of the daily quest, the focus quest can be found.
Every battle you win, you earn Reward Points (RP). There are two types of Rewards Points:
-Focus Points - earned by winning with the focus splinter (circled in blue).
-Season Points - earned by winning with any splinter (circled in blue).
Once per active daily focus (=24 hours), you can choose to change the current daily quest into a new daily quest. You can do this by clicking on the "New Focus" button (circled in green). This will reset any current progress already made with the active daily focus objective, as well as the timer.
After the timers are finished, you can claim rewards by clicking on the "Claim" button. Initially, when claiming, you will see the reward chests. Clicking on the chest will reveal the reward for that one chest. Clicking the "Reveal All" button will open them all at once.
For more in-depth information, see the official announcement: Splinterlands Ranked Rewards Update.
Also see the Splinterlands Docs: for more information on Daily Focus Rewards