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1. Log in, as described in Logging In. 
2. Perform a search, as described in Finding Data. In the search results, each entry lists the relevant collections (program, study, and dataset). An edit icon appears next to each of your collections.
3. Click the edit icon next to the collection of interest. The User Metadata page appears with the collection name.
4. Specify the information for the collection:
   • To add a metadata attribute, click Add Metadata. A blank attribute row appears. Specify a unique attribute name. (Repeat for additional attributes. To delete an attribute, click the X.)
   • Specify a value for each required metadata attribute. (The identifier attribute is read-only.)
5. Click Update.

Also refer to:

• Managing Group Access to an Existing Collection
• Managing Edit Permissions for an Existing Collection