You need to post in one of the subcategories. This way all resources are neatly organized and can easily be found by people looking for them. Nobody can post in the top-level category.
We do not restrict posting for new users. We only restrict images and links in the first posts, but once you read a few posts and spend time here the restriction is lifted. I’ve set your account to trust level 1, so you can now bypass these restrictions.
Also for others who might read this, if you need more permissions you can always send a message to the moderators inbox. We can update your trust level if you tell us that you are not a spam bot.