Setting my Samsung ST76 to 1MB photos - Samsung Cameras

The ST76 doesn't have a 1MP setting. The two lowest settings are 1024x768 (0.7MP) and 1920x1080 (2.0MP). See page 49 of this manual: http://downloadcenter.samsung.com/content/UM/201203/20120322190056420/ST77_English.pdf

However, as Harrie has said, in general you're better off shooting at a higher resolution and down-rezzing on your computer if you need to use a photo on the web or in an email.

I do not complete understand what you want. My fuss is, you want every picture to be about 1 MB on your memory card. I do strongly advice against this, but you own the camera and so it be. You always can make pictures with a smaller resolution from high quality pictures, but never the other way around. You better shoot highest quality on your camera and later wham the pictures are on your computer down size the ones that are less important to 1 MB.
But you can choose 5 mega pixels with normal compression or 3 mega pixels with fine compression or 2 mega pixels with super fine compression. All these pictures will look fine in an e-mail, or on the net. Even a 6 by 4 inch picture will look fine. Memory cards will cost like 1 dollar pro Gbyte, so my advice is buy a few 8 or 16 Gb cards and shoot in high def.