How to set the start page

Greetings
I have successsfully installed nginx. I wish to set the start page of my static website, but the start page is not in the root, but in a subfolder called /en
I tried changing the directive in the config file from
index index.html index.htm;
to
/en/index /en/index.html /en/index.htm;

But nginx threw an error when I tried to reload.

Please hel me to change the configuration for the start page one level down in the folder structure.

regards
Jimmy