is that Possible to change the name of main account like for example Purchase Order in my company We call it different Name (RTP) if it possible please let me know how? thanks
Account names can be changed whenever you like by editing them in the Settings tab. But purchase orders are not accounts. They are a transaction type. In the case of purchase orders, they are not even transactions that have any financial effect.
If you want to change the title of the form, read this Guide: https://www.manager.io/guides/7877.