How to have “Previous posts”?

Hello, here is my wordpress site.

I noticed yesterday that there is no previous posts in my category+archives section when they display my posts. The number of posts in my reading settings is 10 so it only displays 10 posts but it doesn’t display a previous posts button even though I have more than 10 posts now.

Is there a way to add working previous posts buttons to the archive and categories?

Thank you in advance for those who took the time to read this and help me.