I need iphone14 pro and I have iphon14 right now. how can i trade in?

You can return an iPhone within the first 14 days from tha date of purchase for a full refund.

Apple is not currently taking trade-ins for the iPhone 14 series. You could try selling it and using that money towards the purchase of a new phone.

As Kurtosis said above:

You could try selling it and using that money towards the purchase of a new phone.