How to change the start page on hello-friend-ng to show the post list?

I just started my first hugo blog using the hello friend ng theme.
But I would like to change the current start page, which is just a plain start page to show a list of the recent posts (just like the same theme does under /posts/.
I tried to use the /layouts/_default/list.html as /layouts/_default/index.html but it didn’t work.
Nothing was shown.
I am stuck with this and don’t know what to do.
Any help will be appreciated. Thanks!

I solved it: