Not Connecting Galaxy Classic 4 watch.

Like babowa wrote, your question appears to be about a Samsung Galaxy watch, not Apple.

If it is about a Samsung device, you'll need to contact them for help - Samsung Galaxy won't connect to phone - Samsung Help

If it's about an Apple Watch, try the steps here - If you can't pair an Apple Watch with your iPhone - Apple Support

First, we are all other Apple users and this is not Apple support.

Second, your question appears to be about a Galaxy watch? It'd be best for you to contact Galaxy support about their product.