Despite the answer being available in the FAQ Table of Contents, we still get questions about this now and again so we're putting the answer up here where people are more likely to see! 
If you have any questions or troubles within the promotions section, feel free to contact any of your friendly Forum Moderators/Admins. We're always happy to help!
Thank you for your kind understanding.
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ANSWER:
The "Promote your Videos and Channels" section only allows Full Members to make threads. More information on becoming Full Member in @McGahan's post here. This measure was put into place to reduce the amount of spam in the forums.
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ANSWER:
The "Promote your Videos and Channels" section only allows Full Members to make threads. More information on becoming Full Member in @McGahan's post here. This measure was put into place to reduce the amount of spam in the forums.
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If you have any questions or troubles within the promotions section, feel free to contact any of your friendly Forum Moderators/Admins. We're always happy to help!
Thank you for your kind understanding.