Can't see how to add themes or plugins

Hi,

I looked at the admin manual, it tells us how to add a theme and plugin, yet I can't see them to add them. I have the sandbox theme, but there is nothing else there to install the themes. Is it because of the upgrade? I went and changed the upgrade to 184, still nothing. Thanks

Beginning Developers

Beginning Developers

This space is for newcomers, who wish to build a new plugin or to customize an existing one to their liking