One of the ways to improve the findability of content in Jive is to add tags, especially if the author has not included specific keywords as tags that people are likely to use when searching for that content. But users who are not system administrators can't edit tags on content they did not author (except for documents).
Here's a simple hack that gets around this and allows users to add tags to content they did not author: add a comment on the item and insert inline tags in it. These tags affect the search results for the original content item. Since people may not be familiar with how to create inline tags, here are quick instructions.
To add tags to content that you can't edit (everything except documents), add a comment on that item and insert tags in the comment. You can insert tags inline in text in Jive by typing # and then typing the tag. The trick is to let the list of suggested tags pop up and select the one you want, or else create a new one. You'll know you were successful when the # changes to a tag symbol. See, for example, these: