Is it because your rank is "Newbie". Posting image is not available at newbie rank. You must atleast rank up to Jr. Member in order to unlock this feature.
You might want to try to purchase the special membership -
Copper MemberIt allows even a newbie rank to post images by paying about 0.002 (not sure if the price changes over time).
Yes, it is a good idea. If you want to post images
even your rank is only Newbie. Then go and purchase a copper membership to Sir theymos. It won't cost too much.
Your question is already answered right from the beginning by Sir Jet. You should lock the thread now or else it will be flooded with spam posts.