All this is further explained here. In respect to this, how do I edit a protected Word document?
Open the Restrict Formatting and Editing task pane
Furthermore, how do I remove content control? Press Ctrl+A to select the entire document. Right-click a visible content control. In the context menu, click Remove Content Control.
Likewise, how do you unlock a table in Microsoft Word?
If you are using Word 2000 or later, the process is slightly different:
How do I turn on content control in Word?
View the Developer tab to add or change content controls To add a control, click in the document where you want to add it, and then click the control you want to add on the Design tab. To set properties on a control or change an existing control, on the Developer tab, in the Controls group, click Properties.