Click "PARTICIPANTS"
2. Click "ATTRIBUTES" from the left navigation tab
3. Click "EXTERNAL IDENTIFIERS"
4. Click "CREATE NEW"
5. Enter the source for external identifier (Platform / vendor name for which you want to save the participants id)
6. Identifier is auto generated that would be available to append to the URL. The identifier name can be edited to the variable name that you want to use, or one that matches the name of the variable from the source.
7. Option to enter the description for identifier for future references.
8. Click "CREATE" to create the external identifier.
9. Newly created external identifier is now visible in the list of external identifiers for the research domain.
