Paul,
To upload pictures
a/ Choose 'Attachments and other options' below
b/ this brings up the 'Attach' option
c/ Press the 'Choose File' button. Then select the picture you want to upload from your computer - if more than one then select the (more attachments) selection
You can upload up to 10 pictures per post but please edit them to no more the 800x600 pixels to save on data use.