Open the patched ROM in your emulator. You should see a menu (often toggled via the or a specific button combo like L+R on a controller). Configure your hotkeys for Frame Advance and Slow Motion.
This is the most vital tool for tech analysis. The practice ROM can overlay your controller inputs on the screen (viewable in OBS for streamers). It also allows —pressing a button to move the game one frame (1/60th of a second) at a time. smb practice rom