Hi David, welcome on Steemit. There is no need to test out the platform, it's been tried and tested for over three years already!!!! 😉

First impressions are very important here and sets the scene for your account. You can write a proper post to introduce yourself, and use the tag introduceyourself. There are plenty of people who look through that tag everyday to welcome new users to Steemit. And in case you're wondering, yes, there are real people around here!!!

By the way, I notice you're from UK. There are a bunch of UK Steemians who meet up regularly. If you ever want to meet Steemians in real life it's a great to hook up with them.