In your project folder you should have a .sln file, if you don’t have it (but you really should if it’s C++) right click the .uproject file and create it:
Open it, and then be sure to select “Development editor” in the top bar:
In the Solution explorer, right click your project and click “Build” or “Rebuild” (the first one only compile files changed from the last build, the other one rebuilds everything so it’s slower, but sometimes it’s needed)
If there’s any error it should pop up in the console