Sorry emdee, but after a corrupted pic was uploaded onto the forum a short while ago, which caused all sorts of techy nightmares, the 'attachment' facility was disabled to stop a repeat of the situation.
The only way to now add pics into your posts is to use an external hosting site such as Photobucket, Flickr, Imageshack, etc etc.
Using a source such as those will ensure the integrity of the forum is not compromised in the future.
hth, Gareth.