Editing Comments 
There are several edits you can make to comments:
Amend information in text, cloud, or dimension
elements.
Change
Properties on the Markup
tab in Tools, Options.
Revise text in the Description
box.
Change the shape and location of geometric elements.
Delete comments.
NOTES:
You can edit only your own comments.
For parts and assemblies, you can edit only the
active comment . For drawings, you can edit all active and inactive comments.
To activate a comment, select it on the Markup
tab.
To amend information in text, cloud, or dimension comments:
Double-click the cloud or text in the graphics
area.
Edit the text in the text message box, then click
.
To revise comment properties:
Click Options 
on the Markup tab.
Click Tools, Options
and select the Markup tab.
Right-click
a comment in the 
Markup
Comments tree and select Properties.
Right-click
a markup element in the graphics area and select Properties.
To revise the description:
On the Markup
tab, select a comment.
Edit the text under Description.
The edits to the description are saved automatically.
To change the shape and location of geometric elements:
Select the geometric element in the graphics area.
Drag the handles 
to edit the shape
of the geometric element.
Drag the element (not the handles) to move the
geometric element.
To delete comments:
Select the comment on the Markup
tab, then press Delete.
Right-click the comment on the Markup
tab and select Delete Comment.
Right-click a markup element in the graphics area
and select Delete Comment.