Have you finished all the 8 returns that you have purchased before? In order to link another activation code to the same account. You first need to use all the 8 returns, and then you will be able to activate the second code. Please also make sure that you have purchased the right edition (version) of TurboTax.

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I have used a 8 returns on my turbo tax standard

can someone give me the step by step instructions to add my newly purchased 8 More returns.

with a new code

@Quartermain5 Are you using a Desktop version?

 Version bought at TT TI TY24 standard deluxe costco

@Quartermain5 Once you've finished your first 8 returns, you can enter your second code by selecting Tools > Licence Code Switch from the top grey menu.