How to add a trend line with Day Column and Any Integer Value

Hi,

I have created a Worksheet in which , there is a bar chart:-

1. In y-axis , there is an Count of Error (Suppose).

2. In x-axis. there is a  Day (1,2,3).

Now, i want to add trend line into these two columns. Is, it possible to add trend line condition into chart.

Regards,

Aman