How do I update my income on my HMRC account

Although I have an account showing my income details and tax code I need to access the income details as they are incorrect The HMRC are working out my tax code on incorrect figures and this is making my PAYE tax code too low I used to be able to access my self assessment account when I was working but now I’m on the normal PAYE system I can’t access my account to alter my income figures form my UK GOV and personal pensions Can anyone advise please Thanks

Hi,
To amend the amount of estimated income used to calculate your tax code, please contact us by webchat or phone, via:
Income Tax: general enquiries Please note, these figures are based on the income details reported by your employer.
If the income details reported by your employer are incorrect, please contact your employer to discuss correcting them.
Thank you.