Home Forums Peripherals & Multimedia iTunes, iPhone, iPod, iPad, Apple TV adding received mail to email address in sidebar.

OS 10.14.6

I had a problem with my mail which now works ok. Before the problem, I had (2) email addresses at the top of the sidebar and upon clicking, the received emails appeared. Both of those have disappeared and I managed to put them back under
"on my mac" These I dragged to the top of the sidebar but upon clicking either one, doesn't show any emails. How can I recover the original (2) addresses at the top of the sidebar which will reveal all received emails?
Trouble is, I don't know how to recover those (2) email addresses. Can anyone help me?

jaybass