Go to your Admin "home" (select ADMIN from the dropdown next to your avatar). Select "Tags" from the left-hand nav bar. From here you can create a new tag, and delete old ones. Note: If you delete a tag, that tag will no longer appear under any question with that tag.
When you're in the Questions>All Questions view, you can quickly find questions labeled with the same tag. This will create a source link you can use to share questions labeled in the same manner (for example, all M&A-related questions labeled with an "M&A" tag).
More questions? Go back to the Support page.