I guess you mean how to change the annotation that shows the tag? The tag itself i just a collection of fields, which you can recognize when you set the tag for a component.
I attached a small chapter (some basic stuff) that might help you to understand how an annotation can be created, hope that it points you in the right direction.
Barend-Jan (BJ) van Zijtveld
Start with some of our most frequented solutions to get help installing your software.
The AutoCAD P&ID forum has moved into it's very own category page, and can no longer be found within the Additional Product Forums.