On the top of our ceramic scraper, you’ll see an orange slider button, which is used to set the blade position. As part of that mechanism, there is a small tab with the image of a lock engraved in it.First, set the handle to the exposed blade position. Then, press downward on the “lock” tab so that it won’t catch on the dark grey handle. At the same time, push the slider as far forward as it can go. Your blade should now be fully exposed and easy to lift off the orange blade holder. Simply remove the current blade and replace it with a new 10526 or 10528 blade, lining up the blade notch so it sits in the holder. Then press on the slider mechanism again and pull the blade all the way back into the housing.