If you are looking for proper guide about this forum you can use search button and you can check on front page of this forum you can search anything you want like "I am new here", "how to add image in post" etc
To make contributions, posts for discussion, a poster does not always need to add images.
Images if overused will become annoying and people with low internet connection, bandwidth will have difficulty to load pages of thread.
Newbies can not post images, by the way, and will need to rank up to Junior member (1 merit required) to post and display images. Alternative, buying the Copper membership to display images.
Newbies can now pay a small fee to enable images.