Synology Ethernet/Internet sharing via aditional LAN?

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How to Set Up Synology in the way i want. For instance; My model 1621s+
I want to connect an Ethernet cable from my router to my Synology, and then I would like to take another Ethernet cable and connect it to my PC from that Synology NAS to continue sharing the internet. In simple words: Home Router -> Synology NAS-> to PC in order to have both internet and direct connection between my PC and NAS.
How to use NAS to get the Internet to my PC with using an additional switch?

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Synology do not work as a switch. You can only -Link aggregate two LAN ports, -enable Load ballancing or -have a secondary LAN as a failover option. Only Qnap allows virtual switch that allow you to connect other computer to a NAS and get the internet passed through a NAS. You can get a cheap $10 Gigabit switch. The cable you want to connect to your NAS - first connect to this switch. Then you can connect a NAS and a computer to this switch.