So, you are trying to upload an image to your website when you get an error saying it's too large. Sorry about that!
The maximum upload size varies for different sites but a good rule of thumb; try keeping the size of your image lower than 300 kilobytes. Remember; mobile devices will have trouble downloading images bigger than this which can make your site look terrible.
To fix this error we need to make the image smaller. Luckily this is a simple task.
Go to http://www.picresize.com/batch.php - and follow the instructions. Save the new file and try your upload again.