Are you asking how to make a pet pic wind up here in this thread with your comment?
If so, you just go to the last posting for the subject (not the quick reply) and click on reply. then a window comes up with an area for your comment, smilies to the left and below the box for your comment it says "File Attachments" you click on browse to find your pic on your computer then on the file you want to upload and you a ready to go. There is a blank space to the left of the word browse to put a title.
Important: Do not preview the message as it does something wonky with the pics.
Hope this is understandable and helps.
Welcome to the board.