EasyChart DB Pen Diagnostic Time column is not indexed

Hi there,
Can anyone help me understand what is wrong with the t_stamp column I am trying to use for my DB Pen please? I ran the diagnostic and I got this not indexed message. and basically an error on the chart. the time column i am trying to use is sql datetime column.
It looks like this

You’ll need to add an index to daytime in your database management software.

If you’re unfamiliar with the concept of indexes in general, here’s a primer. https://www.essentialsql.com/what-is-a-database-index/

For whatever database you’re using, just google “How to add an index <database type>” and you should find plenty of results.

Thanks for that Kelvin.
Ya i just started learning SQL last week or so. not familiar at all with database…
I will have a look at the link you gave me.