Hello, Proudpixel,
Thank you for reaching out to us.
XStore Builders > Posts archive > Add template.
As for setting the number of posts per page, this can be adjusted in the WordPress settings:
1. Navigate to Settings > Reading.
2. Locate the option “Blog pages show at most”.
3. Set the desired number of posts per page and save the changes.
Warm Regards,
The 8Theme Team