Q: what do the tiny icons on the upper right corner of my MAC indicate?

Hi, do you mean like these?

Your going to have to take a picture of them and post here

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How to show us a screen image.  Avoid personal identification.

on the Mac you do:

command + shift + 3  Will take entire screen.  You hear a click.

command + shift + 4 Lets you decide what to take.  Mouse pointer changes. Move mouse to upper left corner of desire image.  Hold down left mouse key where to start image.  Drag mouse to lower left of where you want to stop image.  Release mouse.

You will get a picture n.png file on the desktop.

On Windows it's more complicated:   -- get a screen capture app.   -- press prtsc key       results go to copy buffer       get some photo app       open photo app       paste picture       save picture as jpeg or png to desktop.

On the forum input panel you will see the camera icon.

click on camera icon.

another window will appear.

Make sure you have selected the from your computer tab.

click on Browse button

An open file panel appears.  Select the file.

After selection a file, I have this screen showing.

You will have to click on Insert Image.  You may have to scroll down to see Insert Image button.