Please how can I find my lost iPhone with the IMEI

You cannot track it through the IMEI.

See here: https://support.apple.com/en-us/HT201472

~Lyssa

I am also curious on how to track my lost iphone using IMEI.

I have reported my phone missing at a Police Post in Fiji with my IMEI number for easy tracking.

You don't. You can use the IMEI to report the theft to local authorities and to your cellular carrier so they can blacklist it.

~Lyssa