Financials has an audit system in place, but it can't track everything. It can only track the following:
Adding a User
Editing Customer Bank Details
Editing Supplier Bank Details
Creating a New Customer
Creating a New Supplier
To see the audit results, click System, Audit, Security Audit. Change the filters and search for the results required.
If a user is unable to see this report, then you may need to activate visibility of the report to users as follows:
From the menu select System, Security, Profile
Select the relevant profile for the users
Go to/expand the System section
Click Edit
Tick the Security Audit option
Click Save
The users will need to close and reopen Financials to access the report.