Monthly payments struggling

Can I change my monthly payments to lower for a few months as I’m struggling to pay them? I tried to do it online, it allowed me but still says it’ll take out original amount next week?

Direct debits are initialized about 5 working days in advance of the payment.

If you’ve changed the amount within 5 working days of the payment being due, then there’s nothing you can do to change it now. It will change from the payment after that though, as you’ve seen.