[deleted] I need a USB with the Live ISO, right?
I'm pretty sure Girtablulu meant a DVD. I don't think any CD would work. A high-density CD will hold 700 MB, and if I remember right, a Solus installation requires almost 2 GB.
Lots of computers these days don't even have a DVD player, because USB drives are so popular and cheap. If you haven't burned an ISO to a DVD drive, a good utility to do that is Etcher, and it's in the Solus repository.
If I'm telling you what you already know, my apologies. That's better than not telling you enough.