Okay kiddo, so when people want to change something that has already been decided, they use a special word called amend. It's like when you draw a picture and then decide you want to add something to it, so you change it a little bit.
Now, when grown-ups are in a big meeting and they want to change what they have already decided, they use a motion to make that change. It's like asking everyone in the meeting if they think it's okay to change the decision they made before. Then they vote on it to decide if they will make the change or not. If most people say yes, they can amend the decision and make it different. It's like everyone agreed that the picture needed a change and they all voted on how to make that change.
So, that's what amend (motion) means. It's a way to change something that has already been decided by asking for permission and agreeing on the change.