You may want to post in the right section, firstly. Moved to the support forum.
You may also want to be patient. And thirdly, try looking. There is a large pinned topic in the support forum which details step by step how to put images in your signature.
QUOTE
Q. How do i attach an image to my post?
On the post screen, click the 'Browse' button down in the 'File Attachments' area. Select the file you wish to attach from your computer - an image attachment must be no larger than 250k, and should be a GIF, JPG or JPEG. Once you've selected the attachment click 'Add this attachment' to add it to your post. You can include more than one image attachment to a post. When your happy with the post and the attachments, submit the post. If you have trouble with the image attachment process, check below.