Go to the page toolbar (blue icon in the upper middle of the screen). See what page your players are on, it's the one with the red ribbon saying PLAYERS. Hover your mouse over that, and a new blue icon appears, of a gear. Click that for page settings. Turn off fog of war, advanced fog of war, and dynamic lighting, and your players should be able to see your map now. Note that if you want to use dynamic lighting, and you want players to see only what their tokens see, you will need to create at least minimal characters for them with tokens, set those tokens to "Have sight", and place them on the map.
