The new CDS Customs System in the UK starts for imports on 1 October 2022, and for exports on 1 April 2023.You need to register for imports and/or exports before you can use the system, and there is plenty of help on the Government website.
Before you start your registration, you need the following information:
A Government Gateway ID and password.
Your EORI number.
Your 10 digit Company Unique Tax Reference (UTR).
Address of your business as recorded on HMRC records.
The date of incorporation of your business.
You can register by using the following link:
https://www.gov.uk/guidance/get-access-to-the-customs-declaration-service