Vertices in DLTCEP

[temnix]

I'm following the readme of DLTCEP to create some triggers. This is what the readme says:

"25. Now lets set up an Info Point, click on Regions Tab.
//you are on the regions tab now
26. Add a blank region. And change Region Type to 'Info'. 
27. At this moment vertex editing is done solely by hand. Lets build a single rectangle info point. Click on Add Vertex four times to create four nodes."

There is no Add Vertex button here, however. What gives?