What information are you trying to enter? Are you trying to enter personal information?
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If you are filing a Joint return you enter both of your info and income the same way on the same tax return. When you enter a W2 or 1099 it will ask who it is for.
Or are you filing Married filing Separate? Then you need to setup your own separate account. Online is only good for 1 return per account. But you can use the same email address for 5 accounts. How to start another return in the Online version