Hii!
Your question is quite unclear. If you want to get a certificate in journalism, you can ask to the respective firm you are currently working in. If you talk about any certified Journalism course, you can search for them online. Check out for the eligibility criteria first. If you want to continue your studies and study journalism, you can take admission in 10+2 as a private candidate, complete it and then go for further studies. If there's anything else you want to know, kindly let us know.
Hope you understand.
Good luck!