KMTC application is done online using the KMTC portal as indicated below.
You will be required to pay Ksh. 2,022 as application fee.
The minimum requirement of doing a diploma course at KMTC is C (plain). Minimum subject requirements will also be considered depending on the type of course that you want to do.
Kenyayote has written a detailed guide about studying in Kenya Medical College: https://kenyayote.com/studying-in-kmtc-application-admission-to-graduation-steps/