Integration issue between 3G modem (Dlink DWM-156) and Route

Hi Dear Sir/Madam,

I’d like to inform you that for our project I need to integrate the Routerboard 751U 2HnD to 3G/2G network and for this case, I provided a 3G modem (Dlink DWM-156) but when I connect it to the USP port of the router, I haven’t found any USB Interface In the list of the Interfaces, meanwhile the router has detected the model of that modem. so would please help me that how can I resolve this issue?

Thanks a million.
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I would also like to use this modem with my MikroTik rb please.