From the link you provided, I can't pinpoint the mobo model but it says its a b350 atx mobo. And it also says there is one m.2 slot and 2 2.5" and 2 3.5" bays. So from that I can infer that there is enough expansion space for a user.
You can easily install a m.2 ssd or nvme drive in the m.2 slot. Also you can use one of the 2.5" bays inside your desktop tower case for a 2.5" ssd.
If you have no clue as you have said, I could guide you how to install an ssd on your desktop but it would be too lengthy. So I thought i would just link you some basic youtube videos on how to install m.2 drives and 2.5" ssds.
And read the manual that came with your pc and also the mobo manual to know where the m.2 slot is, if you cant figure it out yourself.
for the 2.5" ssd
https://www.youtube.com/watch?v=8JOxKSkkdMM
for m.2
https://www.youtube.com/watch?v=JCTFABytrYA (first locate where your mobo's m.2 slot)
And if you need more help, let me know.