Color Footer and Menu

you will have to go to the customize and then select the primary header and the footer section

Hello,
but I can’t change the color. I think I cann change it only in the CSS cheat.
But where exactly?
Greeting.

Add to Additional CSS customizer section:

.menu-items {
  color: green;
}
.footer {
  color: green;
}

Use whatever color you like in place of green. Note that this is the text color. Background color is unsurprisingly specified with background-color.

Thank you very much.
Is it possible to colour the background of the footer in green and the background and/or the drop-down in the menu?
Greetings

Well, you don’t want both text and background to be green ??

.footer {
    color: red;
    background-color: #050;
}
.menu-items, .menu-items > li ul {
    color: red;
    background-color: #050;
}

Not a great colour combination, I’ll leave it to you to fine tune the colours. Learn to use your browser’s element inspector developer tool to help you do this. You can try different colour values and immediately see how they look on the page. Copy the result to Additional CSS.

The tool also has a picker function where you can select various elements on the page and the tool will display the related HTML and all applicable CSS. Anything you change in the tool will not persist unless you copy the changed rules to Additional CSS.