Its hard for me to do Vibrato

How do i do the vibrato? I dont know how is it something natural? Is it because i am tenor? Anybody help please

Vibrato is natural, but it typically develops as a result of other technique being in place (breath, cord closure, relaxation, etc). Please see below for some lessons to help!

https://www.30daysinger.com/tutorial/14-day-vibrato-course-with-abram

https://www.30daysinger.com/tutorial/foundations-of-vibrato

https://www.30daysinger.com/tutorial/vibrato-for-beginners/1

https://www.youtube.com/watch?v=Y-DP5SOOhgs

https://www.30daysinger.com/tutorial/14-day-vibrato-course-with-camille