• Android
• iOS
• Desktop

Android

To change the color for a contact:

1. Open the chat with your contact.
2. Tap the contact name or header to view options.
3. Tap Color and choose a color.

To change the theme:

1. In Signal, tap your profile  > Appearance > Theme.
2. Choose Light or Dark. 

iOS

To change the theme:

1. In Signal, tap your profile  to view options.
2. Tap the moon icon in the top-right corner.

Desktop

To change the theme:

1. Open your Signal Desktop preferences:
     - Mac: Go to Signal > Preferences.
     - Windows: Go to File > Preferences.
     - Linux: Go to File > Preferences.
2. In the Theme section, choose Light or Dark.