1. Open the Character Selection menu: You can access the character selection menu by pressing the "O" key on your keyboard.
2. Select a Character Slot: Within the character selection menu, you will see multiple character slots. Each slot represents a different character that you can play as.
3. Click on the Character Slot: To switch to a different character, simply click on the desired character slot.
4. Confirm Character Switch: After clicking on the character slot, a confirmation message may appear asking if you want to switch characters. Click "Confirm" to complete the switch.
5. Load Character: The game will load the selected character, and you will be able to play as that character in the Realm of the Mad God.
Note: It's important to keep in mind that switching characters may result in losing any unsaved progress or items that you had equipped on your previous character. Ensure that you save your progress before switching characters to avoid any potential loss of data.