Rather than immediately answering your question, it has to be said that your question immediately begs another question - why do you want to make your skin fairer? Black skin is beautiful, so be proud of it. If you don't believe that, then just have a look at how many white people spend dangerous amounts of time under sun beds, or actually in the sun trying to get darker. There are so many beautiful, famous black men and women, who are great strong role models and are proud of who they are and have learnt that beauty emits from us when we are confident.
If you are absolutely determined to change the colour of your skin, then there are bleaches that you can use that are designed to make skin lighter, but the results (no matter what the manufacturers claim) can be patchy and uneven.
Besides having the potential to make your skin look patchy, you should be aware that there have been repeated health warnings against using these creams because some of them have toxic chemicals, such as hydroquinone, which can cause irritation, or even infection.
If you are still not convinced that your own colour is the best, then just Google skin bleaching and have a look at the stories of some of the women who have used some of these products. The common consensus of opinion is that they wished that they had never started using these products. The gel that the bleaching product is in can cause stretch marks, and the process can become a bit of an obsession because it has to be repeated so often.
Instead of spending time and money on these products, perhaps you should spend some time examining why you want to change your skin colour, and working on being happy in your own skin. If you have confidence issues, or any other type of issue, changing your colour will not change those. You are beautiful the way that you are, so don't change it.