How to change value of existing row and column in a data table

I’m getting target invocation exception error message,
Please guide

I want to update the datatable after every time http request is run
the columns willbe
{api link , status code , response like (successful, authorized), Action(data received,sent email for errorcode like 401,403,500), dateTime(current datetime)}
how can I append the values of the these rows

all the api are called in different state in reframework

I have total 6 apis , but called for 10 times . This to check the error occured and time of that . like a log to scale the error handling