I created a snowflake but my balance stayed the same

I have just added a snowflake payment on the 'additional payments' tab but it has not taken this amount from my total balance or reduced my overall percentage. Do I need to manually amend the figures somewhere?

Creating a snowflake doesn't affect the balance immediately. It will adjust your monthly budget so your scheduled payment will be bigger. When you record the actual payment is when the balance and progress will change.