If you want to use Blitz3D runtime in your own projects, I would probably recommend statically linking with the 'bbruntime' static lib. Just building the blitz3d solution in msvc2022 produces a bbruntime.lib in bbruntime/Release which should be all you need. The bbruntime_dll project is a bit useless as-is, it's designed to be linked with blitzcc compiler output - it doesn't actually export any symbols - the blitzcc output code is 'injected' into the dll as a resource, and linking is actually performed at runtime.
You'll also need header files, which you can either include directly from the blitz3d project, or copy the headers from bbruntime (and any other required dirs) into a standalone 'include' dir. Either way you'll need to set up a buinch of include dirs so the compiler can find them.