Best way to make your images the right size for the gallery

[Kitartas]

How do you make your images small enough? I don't want them to be blurry

I have PSE

 

[Sherly]

Here is a tutorial about saving for web for Photoshop and PSE. I hope this helps.
https://www.sweetshoppedesigns.com/tutorials/index.php/2011/12/save-for-web/