It's easiest to send image files that are 10k (kilobites) or less as email attachments. You can resize your photos, gifs or jpeg image files using almost any graphic editor.
A nice one that's available online for FREE is at www.irfanview.com. It also compresses image files, which will help your webpages load faster. The chief thing that slows down the loading of webpages is bloated image files.
Thanks for asking!