1. Add a inkling or octoling model.

2. Add any eyebrow you can use.

3. Click add overriding materials to the inkling/octoling model, click materials and click m_eyebrowns. Right click the m_eyebrowns and click float, and type "$alpha", it will remove the default eyebrows.

4. Drag the inkling/octoling model to the eyebrows, and drag the eyebrows to zero.

Hope this helps, I am not a expert or anything, tryin to save you some time!