Problems with WORD

[KatyMac]

I am trying to update a document, but apparently "this selection is locked" - how on earth did I lock it & how can I unlock it please?

Are you using word 2007 ?

Open the template that you want to help protect.
Select the content controls or the group of controls to which you want to restrict changes.
On the Developer tab, in the Controls group, click Properties.

In the Content Control Properties dialog box, under Locking, select either or both the Content control cannot be deleted or Contents cannot be edited check boxes.
Use the Contents cannot be edited option when you want to protect text if it is included. For example, if you often include a disclaimer, you can help ensure that the text stays the same, and you can delete the disclaimer for forms that don't require it.

Note The Contents cannot be edited option is not available for all controls.

I cheated by copying it to a new document & saving that

I'm not very technically ept - is that even the right word?

Sounds like a good work around and probably easier.