I watched th Element Photoshop learner and I used the blu and chose avange and then I saw the color now. The teacher used the shortcut on the keyboard option, controll and z and I would go back to the image.but it doesn't work. Can anybody help me please?
What OS and version of Elements are you using? Added: I forgot you are on a Mac with Elements 2020.
The tutorial is for (an older version of) Photoshop, not Photoshop Elements. The keyboard shortcut Alt+Ctrl+Z (for Windows) is used differently in Elements. The current version (Elements 2020) uses it for the Dehaze tool. I assume that the same is true for Option+Cmd+Z on the Mac.
If you follow the directions of the tutorial, I believe all you need to do is press Ctrl+Z after picking the average color and this will undo the Blur>Average that has been applied but the foreground color will remain.