How do you set options in the _vimrc file?

Hello,

How do you change the options in the _vimrc file?
I'm using a newer version of gVim 9.0 and when I launch gVim, there are options under File -> Towards the bottom -> I've tried all of them but the _vimrc file doesn't get modified and when I open gVim again, my options (background color, etc) are gone.

I'd like to set these:
set nohlo
set ts=4
set sw=4

Please let me know if the _vimrc file is editable from gVim or am I going about this the wrong way (and what the right way is).


Thank you

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