How do I open the IDE without adding code to project?

I have created a copy of the shootergame project.

I hit compile.
It says you have to open this in the IDE to compile it there.

There is no button to open the IDE, anywhere.

The online documentation doesn’t work for me, every search result comes up empty no matter what I type. Sorry if this is answered there a hundred times.

I can add code to project, but then it won’t compile because I done messed it up.
Can anyone please give me the super simple answer to this (I’m sure very dumb) predicament?

Right uproject and click Generate Visual Studio project files and then open *.sln file