You would need to open the Template file, either by going directly to the template in the tree view, or by opening one of the pages, and selecting from the menubar Modify > Templates > Open Template. Once you have the template open, close the original document so the only document open is the template file.

You should be looking at the source code view of the template file. If not, switch to that view. Assuming the meta tags are grouped together (if they aren't, move them so they are), select the meta tags, and click Insert > Template Objects > Editable Region. A dialog box will open prompting you for a name. Enter a name, for example, "MetaTags". Click OK.

Save the document. You will get a prompt to "Update Template Files" which will list all of the files on the site using that template. Click Yes (or OK, whichever the option is). This will update all of the pages on the site. Once this is done, you will be able to go through and modify the meta tags as needed on each page.

__________________
The best way to learn anything, is to question everything.