can i just put my mac in the box you sent me and send it to you without removing my mac from Find MY or without turning off firmware password. I am older and don't know what any of this is.

Here is how to Turn off Find my Mac: https://support.apple.com/guide/icloud/turn-off-find-my-on-your-devices-mmdc23b125f6/icloud

In case you turned on a firmware password on your Mac in the past, here is how to turn it off https://support.apple.com/en-bn/HT204455

We are not Apple. This is a user forum.

If you are trading it in or sending it for repair, you need to remove it from Find My and disable the firmware password before sending it to Apple.