As Alice mentioned in the comments, the editor requests you to send an anonymized manuscript for the review process. The review is most probably double-blind, i.e. you do not get to know the reviewers' identity and neither do they know yours.
Be careful to adjust any language in your manuscript accordingly (e.g. "... as we showed in our earlier research " -> "as has been shown in earlier research ").
For answers on why double-blind peer review is beneficial, see here.
TL;DR This is normal, do as the editor says.