Anchor Field Type
The plugin comes with a field type for Matrix Block Anchors.
Create Field
Create a new field and select Matrix Block Anchor as the Field Type. Name it however suits your project.

Matrix Block
Now add the newly created field to your Matrix block entry types. A new tab with the anchor emoji ⚓ for a title works well for keeping it separate from your other fields. Make sure you add the field to every Entry Type you're using in your Matrix field, not just one.
