Raid Finder Tips please?

So i finally got enough equipment level to go on raids , so i want to go and search for ppl Raiding the Eternal Palace, but when i get into the raid finder menu the only options it displays are Raids in shadowlands =S and the items i need are gotten from eternal palace bosses .
can somebody guide me on how to make it search for raids from other expansions besides shadowlands? or if there is another way to search for other raids in the world ?

BFA is retired content. It’ll be solo content soonish.

Sadly if you want older raids you have to use the premade group finder and select Raids-Legacy. Then type the raid you want in the search bar along with the difficulty. Note that for LFR BFA raids you need to talk to

https://www.wowhead.com/npc=177193/kiku For alliance
https://www.wowhead.com/npc=177208/eppu for Horde

As you cannot use the premade group finder to find a group for LFR. You can use custom group finder for it though. But since BFA content is still set to personal loot, not many groups are going atm. Also note that talking to those NPC’s listed above will put you into a queue by yourself (or your group) and only your group will go in. It is not a random queue for older LFR raids.