How to get adbrite text ads appear many times in your site?

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I use adbrite, they pay high depends on keywords and your site's category. I want to use text ads only because I earn more from them than I do from banner ads. Yesterday, I created a new ad zone which is for "text ads only" and today when I check my site, I didn't see any ads and the "Your Ad Here" is what only appears. Can you give me tips on how to get the adbrite text-ads to show many times in my website so I will not see the "Your Ad Here" every time.