Can you return it? You don't want that. That is a single module. You want a two stick memory kit otherwise you are leaving the added performance of dual channel operation, which doubles the memory bandwidth, on the table.
And, if you have purchased a single stick with the intention of ordering a second one later, that is a poor proposition as well because (Especially with higher speed memory, but with all memory in general) there is no guarantee that even if you buy the exact same memory module later you will actually be getting "the exact same memory module". Or that it will be "same" enough that it will play nice with your existing stick.
See this for more on that:
https://forums.tomshardware.com/threads/amd-ram-compatibility.3210050/#post-19785792
I would recommend returning it, and then ordering a 2 x8GB kit if you are looking to run 16GB of memory. I would also recommend sticking to G.Skill or Corsair. I don't have a lot of confidence in Kingston when it comes to compatibility on the Ryzen platform. I've seen an unusually high number of people have problems on Ryzen with Kingston/HyperX memory kits. Certainly they can work, but I believe Corsair and G.Skill are a much safer bet especially if you use the Corsair memory finder or G.Skill memory configurator tools to ensure you are getting memory that is validated as compatible with your motherboard.