If you would like an easy way for people to able to view your past Newsletters, you can create a menu button (either in your Main menu or your Sub-navigation) that will bring people to your most recent Email Newsletter, with the option to view additional "Recent Issues".
Click on the 'Admin' button at the top right of your website and select 'Menus' from the dropdown
Click here for instruction on how to add a main menu item.
Click here for instruction on how to add a "sub-nav" menu item.
3. Add the link: /newsletters/latest
Here is an example: http://www.nsac.bc.ca/newsletters/latest