All of the photos that I post are uploaded from my computer to my [b:654c4848f0][i:654c4848f0]Photobucket[/i:654c4848f0][/b:654c4848f0] account.
[b:654c4848f0][i:654c4848f0]Photobucket[/i:654c4848f0][/b:654c4848f0] was chosen because photos could be accessed from either home, work, or any computer with an internet connection.
Start with the [b:654c4848f0]Edit Your Message[/b:654c4848f0] window in any YT forum.
Click where you want to insert your photo in the [b:654c4848f0]Message:[/b:654c4848f0] box.
<a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/Photobucket%20Examples/EditYourMessage.png.html" target="_blank">
</a>
Open another browser window, open your [b:654c4848f0][i:654c4848f0]Photobucket[/i:654c4848f0][/b:654c4848f0] account, and locate the photo you want to insert.
Click the <a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/Photobucket%20Examples/ImageLinksButton.jpg.html" target="_blank">
</a> button to display the options.
<a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/Photobucket%20Examples/ImageLinks.jpg.html" target="_blank">
</a>
Move your mouse pointer over the light grey [b:654c4848f0]HTML code[/b:654c4848f0] address box.
<a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/Photobucket%20Examples/HTMLCode3.jpg.html" target="_blank">
</a>
Click to copy the photo address.
The address box will turn yellow and the word [b:654c4848f0]Copied[/b:654c4848f0] will briefly appear and then disappear.
Switch back to the [b:654c4848f0]Edit Your Message[/b:654c4848f0] window in the YT forum.
Right click anywhere inside the [b:654c4848f0]Message:[/b:654c4848f0] box and select [b:654c4848f0][u:654c4848f0]P[/u:654c4848f0]aste[/b:654c4848f0].
<a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/Photobucket%20Examples/Photobucketexample4.jpg.html" target="_blank">
</a>
The HTML code for your photo appears in the [b:654c4848f0]Message:[/b:654c4848f0] box.
<a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/Photobucket%20Examples/PasteHTMLCode.jpg.html" target="_blank">
</a>
Click the <a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/Photobucket%20Examples/Example4.png.html" target="_blank">
</a> button to see your photo.
<a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/Photobucket%20Examples/marilynmonroe.jpg.html" target="_blank">
</a>
Click the <a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/Photobucket%20Examples/Example3.png.html" target="_blank">
</a> button to go back to the [b:654c4848f0]Message:[/b:654c4848f0] box to add your text.
Repeat these steps until you are finished with your post/reply.
Click the <a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/Photobucket%20Examples/Example2.png.html" target="_blank">
</a> button when you are finished.
All of the "images" above were inserted using these steps.
Hope this helps.