To upload from your computer, choose 'Upload a File' from the bottom of the post text editor.
Chose the picture you want from your computer and then select if you want full image or a thumbnail.
o post an image from the internet, click on 'Insert', choose 'Image', and insert the URL (web address of the image).
Alternatively, copy an image by right clicking the image and choose 'Copy Image' and then paste it directly into the reply text box.