Is it possible to amend the CG Part of a filed return by online Self-Assessment system?

I filed the tax return for tax year 2022-2023, for both income and capital gain, using the online Self-Assessment System. I then paid the tax accordingly. Recently I found some mistakes of the Capital Gain part in this filed return (incorrect currency conversion rates were used to calculate the gains and purchased prices). Please advise: am I able to amend the filed tax return of 2022-2023 (the part of Capital Gain) by using the online Self-Assessment system? Thanks.

Hi,
Yes, you can log back into your account and amend it before 31 January 2025.
Thank you.