Dear Livinus,
You can learn how to do it by downloading a book of instruction.
The AIMS book may be found at: AIMS Site
US information may be found at:US Information
I do not know how the Nigerian Athletics Federation works with regard to your problem, but learning how to do the job is not hard if you study.
It will be up to you to find the people in Nigeria who will be able to give you the credential you seek.