@qw5 Did you try the instructions in the following pdf?
If it doesn't work, hand the remote to another person because sometimes muscle memory takes over and the same mistake is made again and again. Make sure you're using the instructions to "work with the TV" and make sure you're using the instructions for the correct remote (there are two).
You can also go to the following URL and go to "setup" and follow the instructions (for the XR15 Remote).
You will find the various codes for Insignia TV in the "codefinder" on the left side of the page. I have copied most of them below. Try each in turn until you get one that controls your TV properly. The first code is: 12049
It may take a few minutes for the mods to approve the attachment below: