[GNC] need help with Vendor post bill

[Heidi Latch]

When I'm ready to Post my vendor bill, where it says "Do you really want to post invoice" It says, post date, due date, description.  Where it says "POST TO ACCOUNT",   "Liabilities: Accts Payable" is suppose to default coming up.  It is blank. When i push the little arrow, nothing comes up??  When i try to ignore it "No account selected"comes up. Please help, I cannot post any expenses until this gets corrected.
Thanks,
Heidi