Are you putting just the picture's file name in the TTOL Image dialog box? You need the full URL and the picture's file name.
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Find the picture on the internet and open it.
When you have the picture displayed, right mouse click on it.
When the options box opens, click on "Properties".
When Properties box opens, you should see a label that says something like "Address (URL)".
Copy the full URL, with the picture's file name at the end of the URL, should be something like this...
https://lh4.googleusercontent.com/-DCdsjtgu6LA/SzTXwO9r69I/AAAAAAAAdls/DG3Y7V_jQR0/w639-h457-no/Mullet_Bay_2009%2B%252812%2529.JPG
This is what you need to paste into the TTOL Image dialog box. I do it this way all the time.
