How do I get back to the page where "You Got A Thumb" and "You Got an Acorn" are after I did something wrong and got dumped out of it? And what is it called, anyway? TIA for answers.

Go to your profile, scroll down to "Some information about CarolHB". You will see "Private system messages" in that section. Click on the link to see the information about thumbs and acorns you received..

@CarolHB,
Also, If you are talking about "System Messages" the Bell up at the top right corner next to the treemail symbol will turn Red when you have a message(you are given a thumb or acorn, or you have any other system message). After you have clicked on the red bell and read your messages it will turn back black. Click on the bell when it is black and it will say "you have no new messages" highlighted with a green background. Down below that you will see "view past system messages" click on that to read the messages you missed or want to look at again.

Thank you - I found it! Whoopee! Never woulda guessed left to my own mind.