It's easier if you have access to a hosting site like PHOTOBUCKET! I have copied an earlier answer to the question.
courtesy of IanM from the TVOC forum (edited slightly for the benefit of posting on this forum)
A question that is often asked is how to post pictures so I thought it would be useful to make a little guide on how to do it.
Firstly the picture needs to be hosted on the internet somewhere. By far the simplest way to do it is to create a free account at
http://www.photobucket.com - once you have done that, upload your choice of photos, the maximum picture-width that this forum will accept is 640 x 480 pixels (note: not the 800 x 600 as in IanM's picture below - choose a size no bigger than 640 x 480)
Once the upload has completed, this will then display all of your pictures for you:
As you can see underneath each image are some links, click anywhere in the text box next to "IMG code" and it will copy the link for you:
Go back to your forum page, and in the text box paste your link (either by right clicking and choosing paste, or by pressing the letter v on your keyboard whilst holding the CTRL control key down). It should look something like this... (note: this should be all you need to do but in order to make sure it has worked, always check in a preview!)
If you are happy with your preview, then just close the preview window and click Post. Voilà!!
That is the best way, in my opinion, to upload photos from your own computer.
Posting a picture from elsewhere on the web:
If you want to put a photo on here that is somewhere else on the web (for the caption competition perhaps) the best way to do that is to right mouse click on the photo you want to copy, and select properties:
then highlight the text next to the Address: (URL) field. Copy this either by right clicking and choosing copy, or by pressing the letter c on your keyboard whilst holding the CTRL control key down.
Then close that properties window and go back to your forum page. In the text box of your post, paste this link (either by right clicking and choosing paste, or by pressing the letter v on your keyboard whilst holding the CTRL control key down). Once again, highlight this entire address with your mouse and then click the Insert Image icon just above the text box, so it looks like this:
If anyone tries to follow these instructions but has any difficulties, please post and let me know then I can amend them accordingly. I hope this helps and that no-one minds me posting it.
Cheers,
Ian
[originally]Edited to add comments by Panel 10:
That's great Ian, could I just add that it doesn't work if there is text already in the 'reply to topic' window, (for me on a Mac anyway), it just leaves a placemarker so add your text after posting your pics.
my own tiny comment
whilst photobucket is very useful, beware that others are able to see the pictures in your account - so, naked pictures of the missus are not the best idea
well unless you're sick, twisted and in need of some medical help that is
thanks again IanM for a very good and comprehensive tutorial
"All modern aircraft have 4 dimensions: span, length, height and politics.
TSR-2 simply got the first 3 right. ”
— Sir Sydney Camm