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 A question about IR filters 

I've a Digimax A7 and I am excited about getting an IR filter. Well, the first thing I needed to know that how sensitive my camera was to IR-filters, and I did a remote control test, in which I saw the light very brightly, so I think that IR photography would work fine with the camera. The thing that bothers me is: how do I install it on the camera, in practice (I hate it when there's no info on the internet about that..)? And why are the sizes that I found on an online store only 44mm or so, minimum. I presume it is mounted on the objective, obviously, but my objective is much smaller, 37mm to be precise? Thank you in advance )  [talk] "