Forgot to file certain profits from Robinhood trade yr 2024

I know I know. For anyone familiar with Robinhood

I rarely trade and particularly rarely sell on Robinhood but I sold last year once early in the year and completely forgot about it. Well I made a fairly decent profit on one etf this year and I sold it but then, of course, Robinhood kept part of it.

I had two questions:

1. How should I go about filing these? Should I just wait until next year or do I have to see my accountant? Or can I just do it through turbo? What form do I fill out if anyone has any insight

2. If I sell anything again (one profit I did in June 2025 was already skimmed by Robinhood) will it keep a percentage of that transaction as well? Will it keep parts of my profit until I have filed the one from year 2024?