Excel add-in is located on the "Home" tab in "Excel"
Clicking on EVE Online will open a new pane with all the options available for import.
Clicking on Add character will open a login window. Once you login, you can select a character form that account. A new window will show you a list of things you are authorizing for import. Scroll down to the bottom and click on authorize to allow excel to import information about your character.
Updating
If user is already running excel when an update occurs, the user will have to reload page to get the update. If a update occurs while the player is offline the plugin should update the next time Excel is started.