How can I add another 1099

There are over a dozen kinds of 1099's.  We do not know what kind you need to navigate to----what are you trying to change?  1099NEC?  1099R?  1099B?  1099E?  1099DIV?  SSA1099?  etc etc etc.

Entering your 1099:

1. Open your return.
2. Search for 1099int, 1099div etc., in the search box.
3. Click on jump to 1099int, 1099div, etc., link.
4. Follow the interview prompts.