How to edit text in - Instagram Buttons 4K pack

Hi Im trying to work out how to change the text #username in these instagram buttons. It is a mov file not mogrt. Im using windows and latest version of premiere pro. Do I need to edit it in after effects instead of in premiere pro?

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To add, edit or delete a caption: Tap (iOS) or (Android) above your photo or video. Tap Edit . Edit , delete or add a caption to your post, then tap Done (iOS) or (Android).