The else clause or statement is a type of condition and appears in the Conditions list box when at least one condition has been added to the Rule pane. The else clause executes if the condition preceding the else statement is not met.
This is your typical else statement as part of an IF/THEN/ELSE block:
If A Then
{ Run B }
Else
{ Run C }
An else statement must always follow a condition. Else statements cannot be moved around in independent fashion. If you want to move the else statement, you need to move the entire conditional block, or delete the else statement and re-create it elsewhere.
Adding a Condition to an Event Rule