A very thorough training/educational resource for GLAMs made by Ally Crockford of the National Library of Scotland. (Click the picture to the right for the link.)
Disclose your affiliation with the Library on your Wikipedia user page before editing. (The user page can be found in the top right corner of any Wikipedia page and can be edited like a regular article).
If you edit articles about the Butler University Library as an institution, other Wikipedia users may perceive a Conflict of Interest. Simple factual changes (e.g.: personnel updates or outdated statistics) may likely be made without raising eyebrows, but more substantive changes should be proposed with a critical eye towards a potential Conflict of Interest. Such articles should be edited using appropriate discussion pages, and encouraging feedback from other Wikipedia editors.
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When editing articles, always maintain the impartial voice. You are writing an encyclopedia, not speaking for the Butler University or its libraries.