As I still do not have Photoshop on my laptop, I have been playing around with Microsoft Office Picture Manager. This doesn’t have many features but I did find out how to compress my image so that it will upload easier on my webpage.
To compress an image using Picture Manager, select picture > compress picture. A menu will appear as follows:
I chose the ‘webpages’ setting and it automatically resized the image for me.
It then lists the original size and the compressed size.