Same client when opening Accounts Receivables

SUGGESTED

When I open the Accounts Receivables to enter a payment, it automatically goes to a specific client (which was set by a previous employee) and then I go to the client that I need to use.  How can I change that so a different specific client comes up every time (like Admin.) so that I do not accidently make a transaction to the client that comes up now?

Thanks for your help.