When you create your Template by making a page and then doing File > Save as Template:
The title within the head section is typically NOT locked on child pages of a Template, although much of the head section IS
locked. If your title is locked, you can go back to your Template and make sure (or change...) that this is what you see in the head:
<!-- TemplateBeginEditable name="doctitle" -->
<!-- TemplateEndEditable -->
Once you have corrected the editable region around the title tag, you can add your meta tags below the title in that region, and they will remain editable in child pages:
<!-- InstanceBeginEditable name="doctitle" -->
<meta name="Description" content="this is a test description" />
<!-- InstanceEndEditable -->
When you save your Template, all your existing child pages will be updated to conform to the Template.
What steps are you taking to create your pages from the template because there should already be 'editable' regions in the page.
1) Set up the main template page then>file>save as Template
2) To create a new page from the template>file>new>Page from Template>Select template from site folder
If you follow the above you should then have an editable region to change the 'title' and an editable 'head' region' in which to insert your meta tags.
Thanks so much guys. With your help I've managed to sort the problem and can now amend the titles on every page.
You're welcome, I'm sure!