To add a profile for a computation module, click the blue Configure profiles link in the General tab at the bottom of the computation module.

Alternatively, you can open the drop-down list in the Profile row and click on <Add profile>.

In both cases, the Configure profiles dialog opens.
Below the left window of the dialog you will find a set of buttons with the following functions:
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Add profile |
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Copy selected profile |
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Delete selected profile |
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Import profile(s) from a *.computationProfile file |
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Export selected profile to a *.computationProfile file |
Add a profile and name it so that the function of the calculation is recognizable.
Then switch to the Placeholder tab.