Hi
After paying for the package used, you will be able to print the forms without the watermark.
If you submitted your return electronically, then adjust your return to refile, you will need to refile electronically as well.
If this is the first time using the software for the tax year, you will need to pay for the package before printing without a water mark.
If you filed your original return using a different software, you can also adjust your return directly from your CRA account.
Hope this was helpful
Heba