Hi Vicky
If you're using the Tools > Letters and Mailings > Envelopes and
Labels dialog, click the Add to Document button. This makes the
envelope page 0. The return address is regular text and the mailing
address is in a frame.
I assume you want to add the attention line at the bottom left. Leave
the cursor in the return address. Click Insert > Text Box and draw a
box in the lower left, then insert the autotext entry in the box.
To print, use the File > Print dialog instead of the toolbar button.
Then you won't get the rest of the document printing after the
envelope. It's easiest to select "Current page", but you could type 0
in the Pages box.