How should we change TRIP's approval manager?

Hi Friends,

Can anyone please let us know how should we change SAP-TRIPS's approval manager name?

Ex: user has entered their exps in TRIP and notification email triggered to their manager (XXXXX is existing manager). Now, in place of existing manager we have to set up new manager name YYYYYY. How should we achive this in SAP _Travel management?

Thanks

Deepu