I have a bungeecord server for me and my friends to use and I am having a problem with the perms. I am running bungee luckperms. On one of my offline servers I have essentialsX but when I try to configure the essentialsX perms it doesnt auto fill in the luckperms editor. Can someone help me?

You need to have LP on all servers and have them synced to the same database. Refer to this;

https://github.com/lucko/LuckPerms/wiki/Network-Installation

I dont really know that much about servers but I looked at the link you sent and it said to link up the data across the network you need to link them to the same database but when I did that it still didn't give me the option to change the essentialsX perms.

Start the editor from your backend servers. Then the permissions should autocomplete. Also you can just type out the permissions even if they are not suggested.

I don't know what you mean by start the editor. Do you mean open the editor? And I don't know what a backend server is, is it the offline servers?

Do you mean open the editor?

Yes

And I don't know what a backend server is, is it the offline servers?

Yes. The bukkit/Spigot servers

I started the editor on the backend server but none of the groups from the bungeecord luckperms are there.

Then you haven't properly synced the servers.
Go through the guide I sent you.

I looked at the bottom of the guide and it said it only handles the bungeecord plugin permissions but not he permissions in the backend servers. Does that mean I cannot sync up bungeecord luckperms with the backend server luckperms and can only sync up all the backend server luckperms?

Please read the entire page...

And what does the header of that section say?

The BungeeCord version of LuckPerms

So everything there applies to the BungeeCord version. Not a BungeeCord setup.

I just tried to sync up two luckperms on 2 backend servers and I got this error code in which is in this pastebin link. https://pastebin.com/WCEgs9C6 (I also read the whole guide btw.)

Look at the Storage system errors page, here: https://github.com/lucko/LuckPerms/wiki/Storage-system-errors

I just synced up the backend servers and it worked, Thanks!