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1. Log in, as described in Logging In. Perform a search, as described in Finding Data. In the search results, each entry lists the relevant dataset collections. A delete icon appears next to each dataset collection that meets the above criteria
2. Make sure your window is wide enough to display the Uploads option in the header.
3. Click Uploads. The upload page appears. 
4. Navigate to and select the collection that you want to delete. Click the deletion option. (For example, to delete a data set, select a program from the program list, select a study from the study list, select the data set from the data set list, and then select Delete Dataset.) A message appears prompting you to confirm the deletion.
5. Click Yes.