Old P4 connect to new router

About 4-5 years ago I got a brand new Profilux 4 and set it up using my Windows laptop with the USB cord. I also put the app on my Android phone.

Since then the P4 has performed flawlessly even through an occasional power outage. I mostly use it to control lighting using a downloaded profile for my Mitras lights, and as an effective thermostat using the GHL water temperature probe and the GHL power strip to turn off and on a water heater and a cooling fan, using temperature range parameters which I programmed in.

But in the last two years:
My laptop died its last breath.
I replaced it with a Windows 11 tablet and an iPad tablet (which has become my primary device).
My android phone had to be replaced so I now have an iPhone.
And the most critical, I updated the WiFi router to a more powerful one, with a new router network name and a new password.
Nothing has been done with the P4 to bring it into this network & device family.

Of course my P4 continues to perform perfectly on its own, but I can't connect to it using MyGHL or anything else because it's not on the new network.

I would like to get the P4 connected to the new network through the new router so I can monitor it using my new devices. Can I make the connection successfully using just the buttons on the front of the P4 box?

Then can I monitor and control water change and feeding time pauses, using my iPad? When I first got the P4 I thought it only interfaced with Windows computers, although I was successful with my Android phone.

I assume my P4 is long due to download some system updates too.

I am not sure where to start.

The P4 should have a hotspot broadcasting for you to connect to then you can change your wifi setup.