Welcome. My name is XXXXX XXXXX would be glad to assist.
The switch you identified with the 2 whites and 2 blacks connected is the 4 way , yes. If you want to replace that switch, you would have to use a 4 way.
Now, if you want to replace one of the other 2 on those lights, they are both 3 way switches. One of those positions could be replced with the dimmer you have already.
i dont know what you mean by "one of the other 2 on those lights" ?
oh., i think i figured it out
one of the other two switches right?
with a 4 way, there are 2- 3 ways that work together with it
yes, i would like to leave the 4way alone then and replace one of the other two
swap either one of them, they will have only 3 wires
ok, thanks much.
Pay attention to the wire on the Black screw
it is called the common
match it to the dimmer common
the other 2 do not matter
is the common also called the live?
no, it is just common, your dimmer has a common post or black screw
the new dimmer has no black screw
ok, doe sit have One odd screw?
instructions say it has a black screw, so they changed something
yes, it has a bronze color at the bottom as opposed to the other two gold ones
Ok, the bronze will be the common, it is always the odd colored screw
so, take the wire off the existing 3 way on the Odd screw and be sure it goes to the new dimmer odd screw
The other 2 wires will not matter, either one to either of the 2 gold screws
ok, great! thanks