I understand. Here are the 3 rules:

1. Law of Identity: each entity is unique unto itself. Words have definite meaning

2. Law of non-contradiction: statements cannot be true and false at the same time and at the same manner or the same sense.

3. Law of excluded middle: statements ONLY has a value of true or false.

Rule number 2 and 3 are related. Different but related. Rule number 2 is about contradictions, which cannot exist (square circles break rule#2 and thus can't proceed to rule3 and be assigned a value of true OR false). While rule number 3 is about the value of the statement.

Understand it this way, statements cannot be true and false at the same time because entities that are true AND false contradict itself and therefore doesn't exist. Rule2 has nothing to do yet with the truthness and falsehood of the statement.
While rule3 is about the value that will be assigned to statements which can only be true OR false. Nothing in the middle. Provided of course it passes rule2, which will determine if it's possible for a statement to even have a value of true OR false. Notice the true OR false (not true AND false like in rule2).

Keyword there are:
Rule3: OR means it's conditional, one or the other.
Rule2: AND meaning it's both at the same time.