How to change Task/Subtask.

I have a document that was initially on version 7 and am now working in 2017.  I need to modify all of the TASK and Subtasks in the document from exp. "TASK 20-07-00-99F-873-A" to "TASK V20-07-00-99F-873-A" and also modify xref tags the same way.  In Version 7 it would allow me to just modify the TASK text but now I am not able to highlight or modify the TASK.

For the xref it allows me to highlight but I cannot make any changes. Below is an example of what I am working on:

If I attempt to select the TASK it highlights the whole TASK document: