siri said to use contacts app for correct pronouciation of my name. how do i do this?

Open your individual contact card. You need to then tap on Edit, the scroll to the bottom and select Add Field. That will open a list of fields that you can add to the contact card and Pronunciation or Phonetic are selections.

It would be better if you can please re-post with a screenshot, in order to understand what Siri said, better. Images/pictures speak louder than words. 

Please understand this is a public forum: While attaching a Screenshot, do not provide any personal credentials, such as IP address, Card detail, email id, apple id, IMEI number, Serial Number, Phone number, Order ID, if you are sharing a map ensure your location is not identifiable, etc.