Access Electrical Panel and Swap Breaker

What happens here

With the new receptacle wired and temporarily placed in the electrical box, proceed to the main electrical panel. Using a screwdriver, carefully remove the screws holding the panel cover in place. Once the screws are removed, gently detach the panel cover, exposing the internal circuit breakers and wiring. Locate the 30 Amp double-pole circuit breaker that was previously protecting the old 250 Volt outlet. Carefully unclip and remove the 30 Amp breaker from the bus bar. Install a new 15 Amp double-pole circuit breaker in its place, ensuring it snaps securely onto the bus bar. Connect the existing 10-gauge hot wires to the terminals on the new 15 Amp breaker, tightening the screws firmly.

Goal: Replace the 30 Amp circuit breaker with a 15 Amp circuit breaker to match the new receptacle.