Newbies are not allowed to post images. Once you become a Junior member, you can use this link -
https://imgur.com to post your image. This will generate a BBcode link which you can use to post images.
You are wrong.
Everyone can post image links, but newbies can not display images with their posts. They only can display image when they rank up to Junior Member, with one earned merit (at least) and enough activity (at least 30).
Due to excessive garbage-posting, you now need 1 merit to be a Jr Member. All existing Jr Members who didn't meet the requirement were demoted. Also, newbies can no longer set
any signature or personal text.
< ... >
Many of these limitations can be eliminated with a
copper membership. In particular, you can set a signature at Member level if you wear a copper membership.
Fortunately, users can see non-displayed images posted by newbies by visiting their post history page, and find those posts (with non-displayed images inside) to see how images look like.