This an extension and I need to know how I can remove this that I have marked here below?

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You can do that by adding a new content type to TCA (mind you, you will have to take care of the FE rendering as well):
to create something like:
However, there is an extension which modifies the TCA by essentially creating new content elements and lets you also define the FE rendering: http://typo3.org/extensions/repository/view/wec_contentelements