Problem with Mail merge with post card

[glr]

This neophyte has successfully created a post card and mail merge with this
forums help. I am encountering an addressing problem.

I am using Avery 5389 post card stock which includes two cards on each page.

I am finding that both cards on a given page have the same addressee. I
need the second card on page one to reflect the next recipient's address.

I am hopeful I am expressing the issue clearly and someone will advise me.

Thanks,

Greg