Login to ArcGIS Online, Locate the CED 109n Field Map Exercise Webmap.
Click open in Map Viewer.
On the right side, click the edit button.

Click new feature.

Click on the map to choose the location.

Enter the landmark name and the description.
Under attachments, click add and locate on your computer the desired picture. Click Add.
Click Create at the bottom of panel.

The point will be added to the map. Close webmap.