Hi geckoForce.
Without further information we are not able to help.
What is the error message? What are you trying? Is this the complete script?
Cheers
Z3R0PTR
EDIT:
If the error is "Unexpected assign", like I assume, the last line is no valid syntax.
What is about the or-statement? If you try to set the text of the three edits, if the edits text within the if-statement is equal to 'x', you should do it in one line for each edit.
extends Node2D
func _ready():
var a
func _on_LineEdit_text_entered(new_text):
if $LineEdit.text == 'x':
$LineEdit2.text ='o'
$LineEdit3.text = 'o'
$LineEdit.text ='o'