|To attach an image to your posts, the image must be 350KB or less. Any bigger and you will get a warning saying it is too big.
To resize an image, go here --> http://www.webresizer.com/
In the area where you are composing your post > scroll down to find Attachments > Click Browse button, this will allow you to search where your image is on your PC > Select image and click open > You will see the image location in the "new attachment" box > Over on the right of screen you will see Add Attachment, hit that.
The attachment will now be added to your post when you hit post thread.
If you want the image within the post itself > hit Insert into post before hitting > post thread.