How to playtest in polystudio?

I think I may be blind, but I can't playtest games in Polystudio, at least not if I don't want to constantly publish game versions.
Read the readme aswell and it isn't *that* obvious what exactly keeping the Polystudio files next the Polyworld files mean.

Sorry for my ignorance, it's probably easier than it seems and I just missed something obvious.

[SOLVED!]

I apparently missed that the bar at the top is horizontally scrollable, you can find the option to playtest from there. Ty bronek for the explanation

helo kindheart!! ^w^ I think im also from the site u mentioned :o Also ya the playtest buttons pretty useful -w-