Start-All Programs-Attachments-Drawing

Open the picture you want to edit, in the menu bar, File-Open

Find the picture you want to open, open

There is an icon for drawing a circle in the lower left corner of the toolbar on the left, which is called ellipse. Click the icon, and you can draw a circle now. Hold down SHIFT to draw a full circle.

circle the part you want to circle.

Click on the second icon in the first row of the toolbar, and select

to circle the part of the circle you want to deal with for processing. Select and copy to create a new working file.

Menu-File-New asks if you want to save what you just edited, click No

and then paste the selected part you just copied. Use the eraser in the second line of the toolbar to get rid of the parts you don't need. It's better to enlarge them with a magnifying glass first, so that it can be handled easily.

it's OK after processing and saving.

the method is a bit laborious, and it is better to use PS, which has many tools and is simple to do.