X-Mirror option not showing!

Hello guys, my name is Felipe and i’m new to the forum. Excuse my english, it’s not my first language.
Yesterday i decidede to start learning the rigging process through the riggind addon on blender. When i add the armature, the X-mirror option doesn’t show on my tool panel. What i’m missing? Here´s a capture of the situation.

It’s in the Options tab on that panel, not the Tools tab.

Hahahahahaha, sorry for making a post on this but I’m new to blender and was struggling with it for days. Thanks!