Here is the first screen you will be brought to, the game cannot be played unless another player connects.

After a player has joined, you will be prompted to enter your username.

From here each player must ready up, after you're ready you may not undo this action. The game will not move forward until each player has readied up.

Afterwards, each player has their own ships that they can drag and place whereever they'd like on their side of the board.

From here each player must select 'done' after placing their ships to continue

In this instance, I'm player John and so I shoot/attack Harry's side of the board. Each player alternates their shots so you cannot fire multiple times per turn. The white squares indicate shots that missed and red squares indicate shots that successfully hit.

After one player has managed to hit all of their opponent's squares that represent a ship, they have won and are prompted with an option to rematch. If both players decide to rematch, the game restarts from the beginning.

On the lefthand side of the screen there is a chat bar where both players can talk to one another. Be kind.