The information is generic, so you'd still have to figure how to apply that for your router.
It usually comes down to two configuration options in your router:
a) distribute Pi-hole to your clients as local DNS server via DHCP
commonly a LAN or DHCP setting
(clients acquiring a DHCP lease from your router will talk to Pi-hole for DNS)
b) have your router use your Pi-hole as its sole upstream DNS server
commonly a WAN or Internet setting
(clients will talk to your router for DNS, and your router will forward their requests to Pi-hole)
a) would be preferred, but some router's may just allow to configure b).
In both cases, you'd end up with a working Pi-hole, but the latter won't allow you to attribute queries to indivual clients.
If your router supports neither, you could still try and configure each of your devices manually to use Pi-hole for DNS.