Trying to set my Apple Watch to iPhone

This Apple Support article describes how to pair your Apple Watch with an iPhone: Set up and pair your Apple Watch with iPhone - Apple Support

Note Step 2 in this Apple Support article: Set up and pair your Apple Watch with iPhone - Apple Support

Hope this helps.

What happened when you tried to pair using the directions provided in the support article?

My apple watch was lost and purchased a new one. trying to Pair with my iphone SE

need to pair manually. what do i need to do?