Find a picture you want somewhere on the internet. If it's a naughty one, don't put it on FR.
Right click on the picture and click on Properties.
Highlight the address and press Control C. (Both CTRL and C at the same time) This places the address (call the URL) in your clipboard.
Go to the Post Reply box in Free Republic. Type any text you want. Where you want the pic, type [img src="xxx"] only use < and > instead of [ and ] and replace the xxx with the address you copied. You can paste the address there by pressing CTRL V.
If you have done it right it'll look something like this:
Always use the Preview button before posting!!!!