I've recently opened a Bitcoin account and also opened a wallet through the site. I'm trying to learn about how things work, and when I click on "Buy Bitcoin" I am prompted to enter my Bitcoin address.  I don't know what my Bitcoin address is or how to find out - can someone enlighten me, please ?

I'm very new to bitcoin, and just finding my way around the site.  When I click on "Buy Bitcoin", in order to see more about how buying works, I'm required to enter my Bitcoin address.  However, I don't know my Bitcoin Address or where to find it.  Can you help, please ?