I try to play videos and they only play 1 or 2 seconds at a time

It plays for 1 or 2 seconds and then you see the circular symbol indicating it's loading for a few seconds and then plays for 1 or 2 seconds and this continues

What's happening is they're buffering. See, it's loading, very slowly, and playing what's loaded, stopping, loading more, playing it, stopping, loading more. The issue is you don't have a fast enough internet connection. Your solutions are as follows: Download the video and watch it offline. Get faster internet. Or let it play for 1 or 2 seconds, then pause it, and let it load the entire video for a couple of minutes before watching it.