'''3.''' Remove the blue protective sheet from the 3 smaller pieces and glue them to the inner side of the thermal block, the one that makes contact with the RPi4. You'll recognize it because it has 3 small rectangular islands that fit the size of the 3 smaller pieces you cut out. You can use your finger to press the thermal pad and stick it. Use your fingernail to cut off the excess, if any.
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'''3.''' Remove the blue protective sheet from the 3 smaller pieces and stick them to the inner side of the thermal block, the one that makes contact with the RPi4. You'll recognize it because it has 3 small rectangular islands that fit the size of the 3 smaller pieces you cut out. You can use your finger to press the thermal pad and stick it. Use your fingernail to cut off the excess, if any.