There are a number of different ways to apply document tags.
1. From the Documents view, right click on a document or folder of documents in the index and select Add Tag. You can also select multiple documents by holding down either Ctrl or Shift:
2. From within a document, click on the Tags icon in the tool bar and select a document tag:
3. From the Search section, you can tag your results by selecting the tag button under Tools:
4. From the Notes section, documents that have been annotated can also be tagged using Tools: