The use of a ">" to get a command box does not appear to be in the online manual anywhere.
At least I could not find it by searching "command", "command line" and reading the articles, nor by looking at keyboard documentation, panel documentation. I also searched the forum using similar terms. I finally got the answer by out-and-out asking on the forum when a support person suggested a command line for a task and put the ">" at the front of the command, but did not at first explain the special function of the ">" -- so I kept looking for a command box or something in the menus, say under tools.
Maybe it is there in the docs and I missed it, but if it's not in "obvious" places, it's just as bad as not being there at all. It really needs to be prominent, since it's the gateway to using commands. It's a rather odd, hidden user-interface technique, and is not in the menus, so it can be very frustrating -- no way to discover it.