do not have form 5498. How do I get credit for payment of rmd?

To clarify, did you take your RMD for 2024? If yes, then you should have Form 1099-R. Enter this Form 1099-R and answer the follow-up questions. If you are unsure about your RMD amount then you can check with your custodian. 

1. Click on "Search" on the top right and type “1099-R”
2. Click on “Jump to 1099-R” and enter your 1099-R
3. Enter the RMD amount for this account on the "Let's get more information about your Required Minimum Distribution (RMD)" screen
4. Continue until "How much of this distribution applied to your December 31, 2024 RMD?" screen and select "The entire distribution was an RMD" /or select "Only part of this distribution was a RMD" and enter the amount of RMD (if this distribution includes RMD for other IRA accounts then you included the amount here)
5. On the "Here's your 1099-R info" screen click "Continue"
6. On the "Did You Miss a Required Distribution From Any Retirement Accounts?" screen select "None of these plans failed to withdraw the RMD" if you met all of your RMD for 2024.