You can only perform topless in free mode and not nude.
The purpose of Free Mode (among other things) is to entice potential clients into a paid-for mode, which will be much harder if you are already appearing nude.
Below, you can see how to disable/enable Free Mode:
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Go to My DirectCam
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Click on DirectCam Settings under ACCOUNT SETTINGS
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Tick/Untick the checkbox labeled Enable Free Preview Mode
*Note: You may also select the maximum period or within any period a user can view you in Free Preview Mode