You can easily take a screenshot on Google Chrome using the Lightshot extension.
In Google Chrome, open the following link: Lightshot - Chrome Web Store and click Add to Chrome:
Now click on the LightShot icon:
Select the area you want to capture, then choose the preferred option:
Create a link that you can use to upload the desired image
Copy the image to the clipboard - you can then paste it wherever you need
Save the image as a file on your local device