With some banks and building societies, you can set them up online, in app or over the phone.
You can otherwise complete a standing order form and give it to your bank. You’ll need the account number and sort code of the person you’re paying
You can cancel a standing order at any time, or change the amount or payment date.
For further detail you can see an in depth guide of Standing Orders and Direct Debits from the Money Advice Service here: https://www.moneyadviceservice.org.uk/en/articles/direct-debits-and-standing-orders