Adding Minecraft accounts to Badlion Client
To add a Minecraft account, click the settings button next to the Minecraft version selector and then click on your nickname. If you do not have a Minecraft account added, click on the space.
Click the "Add Account" button and sign in with a Microsoft account that has a Java Edition Minecraft account linked to it.
Switching Minecraft accounts
To switch Minecraft accounts, you just need to open the Minecraft account selector and click on any Minecraft account you want to use in the game.