Hi joslyn150,
Thanks for posting in Apple Support Communities.
To ensure you can update your Apple Watch, first make sure that you've updated to the latest version on iPhone in Settings. Also, Apple Watch needs to be either connected to the charger or at least 50% charged. If you've tried updating from Apple Watch, try updating from Watch app on iPhone.
1. On your iPhone, open the Apple Watch app, then tap the My Watch tab.
2. Tap General > Software Update.
3. Download the update. If asked for your iPhone passcode or Apple Watch passcode, enter it.
4. Wait for the progress wheel to appear on your Apple Watch. It could take from several minutes to an hour for the update to complete.
Leave your Apple Watch on its charger while the update completes. Don't restart your iPhone or Apple Watch, and don't quit the Apple Watch app. When the update completes, your Apple Watch restarts on its own.
These and additional guidelines are found in Update your Apple Watch.
Regards.