Sorry Roger...missed this one....
TBH don't know about Macs....but in theory it should work the same I would have thought........
Two ways of doing it....1, the prefferred way (cos it doesn't use Paul's bandwidth or storage space) is to use an FTP programme (many free ones about) to upload the image to our own webspace (nearly all ISP's will provide some with your account)....then either click the IMG button at the top of the screen and enter the URL or insert it inbetween image tags
[im g]http://adress goes in here/remember to remove space inbetween im and g [/im g]
..the picture will then show up in your post.
The other advantage of this method is that you can show multiple picures in one reply.....try and keep them smallish (no more than 800 wide) so they fit on the average screen and don't take too long to load for those on dial-up.
Method 2 is to click the Browse button underneath the reply box..........then browse to the location of the image on your hard drive , select open and them submit reply.....DO NOT click preview because for some reason it won't show the picture after you do .
If this doesn't work, there must be some MAC thing going on and someone else who uses one will have to pile in and help
