To learn how the bonuses work for a particular slot machine, just click the "i" icon located in the bar where you place your bets. The game client will display the information you are looking for.
After entering the game, you will see a Play Button that will bring you to the slot. There will be a Counterclock icon with a Spin pointing left where you can see past games to review.
To change your settings for 777 Slots, first launch the game client and click the play button to visit the slots. Next, you can adjust various settings by following these instructions: Use the gear symbol to adjust the sound options for most games. Press the + and - symbols to update the bet amount per spin. Click the play icon to change the auto-play options. Use the full screen and mute icons found in the corner of the screen while playing most games to alter these settings.