You don't need to enter information from your Form 5498 (IRA Contribution Information) into TurboTax - generally you will find the information you need to enter into your return about your IRA contributions on Form 1099-R. There is no filing requirement for Form 5498 - just retain it for your records.
If you don't have your Form 1099-R, you will need to obtain a copy. You can contact your IRA custodian or download a copy by logging in to your account.