In theory, don't do it. The boot is likely to be too flexible, meaning less security as it flexes more than the crampon and possibly moves inside it. You can fiddle about with a C1 crampon to help with this a bit, but – no offence – if you need to ask about this, you probably shouldn't do it.
The other problem is that the upper is probably too soft. The straps are likely to dig in to your foot which is a) uncomfortable and b)possibly leading to cold feet. As you may well need to do the straps up bastard-tight to hold the crampon on to the flexy boot, you'll exaggerate this even more.
Basically, you could bodge them on for short distances on easy terrain, but I wouldn't recommend it unless you were particularly experienced, in which case you probably wouldn't need to ask (again, sorry, not trying to offend!).
Try something like the spikes mentioned above, or a grivel Magic Spiker instead.