You now only need 2 successful posts before assigning your own custom avatar, and make use of attachments.
We still require all members to undergo a 2 post validation to ensure that problematic users do not have easy access to posting offensive material on site.
Please note that the promotion is done on an automated basis daily - please do not post "Why can't I use my Avatar?" questions without waiting for a day first.
Avatar (> 2 posts)
Go into "UserCP" -> "Edit Options".
Scroll down, there is a field to change the avatar.
Attachments (> 2 posts)
Each user is allocated with 512K of space to make use of for attachments (1MB if you have more tha 30 posts). Please use this wisely. You will need to manage your space by deleting old attachments. Best is to get your own web hosting and run the images from your server.