There is no option to just delete the T777 in TurboTax Online. You have to go back to the employment expenses section, choose the option that said you have a T2200, and then go forward and delete anything that is entered on the T777.
The "tools menu" is in the US versions of TurboTax, not the Canadian ones.
If you are still not able to resolve this issue, please contact our phone support team at 1-888-829-8608.