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Make sure you unscrew the presta valve first. There is a small top piece that must be unscrewed before you place the pump onto the valve. If all is correct, you should be able to press onto the presta valve and air will be released. Once your presta valve is open, place the pump nozzle over the valve with the locking tab DOWN. Press firmly (you might ...

First you need to make sure you have the right chuck setup. If the pump you have is the one in the link then it claims to be auto-converting between Schrader and Presta -- you can skip to the next paragraph. But if you have a slightly different pump it may require manual conversion. As you press the chuck onto the valve you should feel some resistance as ...