Was I supposed to add my husband’s w2 at the same time I added mine or does it give the option to add his later?

When you are entering income on a joint return, every income entry screen will either have a spot with both spouse’s names there, or when you click to enter a W-2, 1099R, etc. it will ask you by name which spouse it is for.  You do not have to wait for the software to “ask” you for your spouse’s income.

Go to the W-2 screen and click ADD W-2 to enter your spouse's W-2.

All W-2s are added in the same place.  So there will not be a separate place or question that asks for your spouse's W-2 specifically.

Use the information in this article to add another W-2 for your spouse:

Where do I add or enter a second W-2?