I need to see mine and my husbands tax returns for the past six years

That is highly personal information to view on line. Unless you have the private website of the US taxation system, I don't know how you would go about that. In fact, isn't that something that should be kept by you personally? However, I do believe you can request copies.

Tick

There is no web site where you can look up your old tax returns. See the sticky at the top of the forum regarding how to obtain "transcripts" of your previous returns , which include all the relevant information you may need.