Based on the provided knowledge sources, there is no specific information about editing or deleting tags in Mixpanel's Lexicon. However, I can provide some related information about Lexicon and data management in Mixpanel:
1. Lexicon is Mixpanel's data dictionary that contains metadata about events, properties, and other UI elements Lexicon Overview.
2. Project owners and admins have permissions to add tags in Lexicon, as mentioned in the Roles & Permissions document.
3. While there's no explicit mention of editing or deleting tags, Lexicon does offer various data management features such as hiding, dropping, and merging events and properties Lexicon Data Clean Up.
4. Mixpanel provides options to export and import Lexicon data, which could potentially be used to modify tags indirectly Export and Import Lexicon Data.
Unfortunately, the knowledge sources do not contain specific information about editing or deleting tags in Lexicon. If you need more detailed information about managing tags, I recommend contacting Mixpanel support or checking their most up-to-date documentation.
