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I suspect you should see a "Post New Thread" (as snipped from WTB/WTT section):

290425

Perhaps your access still needs to be granted. You could also try logging out and back into the forum to...

Ability to list items for sale in B/S/T costs $10 annually.

https://straightrazorpalace.com/buy-sell-trade/130584-classifieds-rules.html