You need 10+ posts. After you reach this, you will need to wait for the vBulletin system to automatically run its hourly query update to set your usergroup to Member Level 1 which will give you the permissions.
A way to bypass this is to donate to MPGH ($25 USD), granting you with the Premium usergroup, extra permissions such as unlimited profile changes, and the ability to post links, report posts etc that you couldn't when you were unranked
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