How can I adjust bidvertiser ads in my site???

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Hi myloters, well I know U all are perfect in ur field. I have newly made a free website with yola.com everything is gonna great I add bidvertiser's ads in my site but the problem is when I add HTML widget then It goes either top or bottom in the webpage( u can see my site in my profile)and I want to add bid's ads in the middle of webpage for getting more clicks can someone pls guide me how to do that.....