it really took me a while to figure out how to include pictures in the latex, after trial and error and some online helper, it turns out to be very easy.

add the following in the beginning of the document
\usepackage{graphicx}

and whenever you need to include picture, add
\includegraphics[scale=0.5]{myfig}

make sue two things, 1) the myfig file need to be in the same path of the tex file; 2) no extension of the file should be appended, ex. png, jpg. I don’t know why, but if you add the extension, the texshop gave an fatal error. And the documentation of the texshop actually doesn’t have extension included either when it refers to include pdf and eps. If you get a missing bounding box error, please don’t go investigate bounding box, it’s not related as far as I see.

You can adjust the options in the bracket [], a small documentation you can found from here.

hope the above helps