VERY EASY QUESTION I'm sure: I've added a table to the back-end and I don't know how to link it to front end. I've just copied it into front-end but would rather have it linked like the rest of the database and it does not show up on list of tables when I try to refresh links.....

In your Front End, you need to go to 'File' on the menu bar, then choose 'Get External Data' then 'Link Tables'. Then find the Back End and press 'Link'. Then click on the name of your new table which is not yet linked and press 'OK', and that should sort it.
You don't need to copy the table form the Back End to the Front End - what I just suggested does this for you.
Hope this helps.