529 contribution limit

I set up a 529 account (Ohio) for my Grandson.  I contributed $75,000 for 2025, but want to contribute a total of $150,000.  

 

What is the next step?  When I file my taxes for 2025 do I report this amount? 

 

Can I contribute the full amount in 2025 or should I contribute the other $75,000 in 2026?