You'd want to at least tell us what site you are referring to, before we can have a stab at helping you...
LPT, as stated
Link?
It's the Local Property Tax website. LPT. We're all going to be experts on LPT for the foreseeable future.
https://lpt.revenue.ie/lpt-web/views/login.html?execution=e1s1
it's a bit slow alright