You need to get a combined Wireless "Router/ADSL Modem" - your current USB modem cannot be used with a router. A Wireless Adapter then needs to be installed in the PC and this can be either USB or an internal PCI card, if you have a spare slot.
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.