Forex CFD Trading Loss

My wife and I both did Forex CFD trading during the fiscal year 22/23, but both of us incurred a loss. For the fiscal year 22/23, I was employed but my wife was unemployed for the whole period. 1) Do I need to do the self accessment (for employed + CFD loss)? 2) Does my wife need to do the self accessment (for unemployed + CFD loss)? I have done the checks via the link below and it said that I didn't have to do the self accessment. However, I am afraid if I misunderstood some of the questions. Hope someone could help me to confirm. Thanks. https://www.gov.uk/check-if-you-need-tax-return

Hi Gavin,
If the actual disposals are in excess of £49200 (each) then yes a tax return is required.
If one is not required, you can still inform HMRC of the losses so that they are on record should you wish to use them at a later date. you need to inform us of the losses within 4 years of the tax year in which they arise.
Thank you. 

Hi Gavin When such losses are incurred, how are these reported on the SA tax return. How can I report losses if the tax return has already been completed? Basically my agent is my employer and I do not want to report my CFD trading through them. Many thanks