I need IOS 13 on my IPhone 6

See the chart below to determine whether you can upgrade your device and to what you can upgrade. If you do not have a Software Update option present on your iDevice, then you are trying to upgrade to iOS 5 or higher. You will have to connect your device to your computer and open iTunes to update.

iPhone, iPod Touch, and iPad iOS Compatibility Chart

Maximum iOS Version for iPhone, iPad and iPod touch- Everyi.com

Select the method most appropriate for your situation. 

Upgrading iOS

How to update your iPhone, iPad, or iPod Touch

iPhone Support

iPod Touch Support

iPad Support

Updating Your iOS onYour Device

Tap Settings > General > Software Update

If an update is available there will be an active Update button. If you are current, then you will see a gray screen with a message saying your are up to date.

iOS - Unable to update or restore

iOS- Resolving update and restore alert messages

AmirSims wrote:

How do I get IOS 13 on my iPhone 6?

You don’t. The iPhone 6 hardware is not capable of running iOS 13.