Plugin section missing from admin panel

Recently I tried to embed a video using iframes only to realize that it just doesn’t work. Some googling revealed that the solution is a plugin, however, I just have no idea how to install one. The guides point towards a Plugins section in the admin panel and it’s supposed to be underneath the Appearance section. Unfortunately, it isn’t there.

I also tried to look for information about which version of WordPress I’m using, but apparently that information is nowhere to be found. I assume it’s the latest one as it’s hosted on their own service, though.

Could someone kindly explain what could be going on here?