Go to your WordPress dashboard > Plugins > Add new
Search for “Modern Fields”.

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As it’s relatively new, you may scroll a little before to find it
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You can also download it from here: https://wordpress.org/plugins/modern-fields/
Click on install then activate.
You should see a new “Modern Field” entry at the bottom of the main menu.
Go to Modern Fields menu in the left admin bar.
All your group fields will be displayed there