Delete section option not available

I have completed and submitted my tax return but realise I need to remove an employment section. The help suggests I use the delete section link at the bottom of the page but there is no delete link. How do I proceed? Thank you.

Hi,
For the specific employment you wish to delete, go to the page on your return headed 'Income for (the employer name)'. At the very bottom of this page, on the right, there should be a red link that reads 'delete section'. If you cannot see this link, please contact our Self Assessment team so we can amend your return.
Self Assessment: general enquiries
Thank you.