I have to amend as soon as the form is available, I have to claim 9273.00 that’s already been taxed. And 6155.00 that’s not been taxed. How much will this cost me ?

Do not try to change anything on your return now.  When you amend, your Form 1040X has to be prepared from the return exactly the way it looked when you filed it originally.   You have to wait.   Once your return has been processed you will complete a Form 1040X   --- which is not yet available --- and submit it to amend the mistakes made when you filed your original return. It takes the IRS at least four months to process an amended return.

The Form 1040X you need is under revision and is not ready yet.  The Form 1040X does not become available in the software until the end of March 2021 (subject to change).

https://www.irs.gov/forms-pubs/new-information-for-form-1040-x-filers

"How much will this cost me"  ?

We cannot answer that.  We know nothing about the tax return you already filed or what income was on that return.  You will just have to enter your omitted income to the Form 1040X to find out.