To delete a record, you will need to HTTP POST the following information to http://servername/apiput.aspx

username= 
password= 
path= 
actionid= delete 

The username entry should be a valid username, and password should be a base-64 encoded version of the password. 

The path entry is the XPath to the location in the database where you wish to delete the record.

Note: The API provides no warning or confirmation of deletes. The record and all data below that record will be deleted and this operation cannot be undone. Please use with caution! 

For example:

username=test 
password= 
path=/Reports[Name="My Reports"]/History[ReportID=”46135”] 
actionID = delete