If you have a credit card, simply make payments on time and stay within your credit limit. After a few months you will see some improvement of your credit score. Try not to use more than 30% of your credit limit.
If you want to apply for a card, consider a secured credit card. If your main goal is to improve your score then you may like the . This secured card has more generous terms and conditions and a lower annual fee than some others.
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All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.