Hello,
Hopefully I'm understanding the question, but if you just want to delete an item from the journal archive, you could perform a search for it from: http://servername/enterprisevault/search.asp
Once you find the item, click the check mark beside it and select "Delete from Vault"
If it doesn't delete correctly, then it may be that you are not allowing deletes through Site Settings or perhaps the Retention Category is set to Retain items forever or Prevent deletion of archived items in this category.