Hi, @lenorascholl, welcome to the forums! I’ll be happy to help you with resizing and creating lower resolution thumbnails for posting online. First we need to know what kind of computer you’re using, cause Windows and Mac computers use different software to accomplish that task. Do you know which one you have?
As a general rule, the quickest way (with a Windows computer) to resize photos for the web is FastImageResizer. Just drag and drop your photos over the little FastImageResizer window and it will automatically resize them for you.
If you have an Apple computer, here’s a thread which should be helpful: How To Resize Pictures on a Mac?
If you’re on a Windows computer, here are a couple of links with lots more helpful info: Resize and Compression Tools for Photographers and a video: How To Downsize an Image with Paint (Windows)
If all this sounds too complicated for you, don’t worry, I can walk you through each step. 🙂 Just let me know if you need more help.