If i have a cosigner can i cosign for someone else?

In theory, yes, there's nothing stopping you from doing so. However, the fact that you needed a co-signer on your loan indicates that your credit it weak. Therefore, I'm not sure whether a lender would consider your co-signature much of a credit enhancement. Also, the fact that you have an outstanding loan (with or without a co-signer) affects your credit rating and your ability to make the payments on a loan should the principal borrower default. (You do know that co-signing is a binding committment, don't you?)