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First loosen the screw shown in the picture from the bottom side of the base plate.
Now you can use an Allen key to loosen the pin that secures the tongue inside the dial indicator arm.
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In the picture you can see the arrangement of the individual parts.
The tongue can now be replaced and reattached by repeating the steps in reverse order.
You may need to recalibrate the dial indicator.
To do this, loosen the fastening screw that fixes the dial indicator in the dial indicator arm. Now position the dial indicator by moving it up or down so that both the small and large pointer show ZERO.
When locking the screw do not tighten it too much, this can block the axle movement in the dial indicator.