How to promote Beta Testing of a new script?

Well the question of beta testers is one I have thought about before when I became a beta tester for a homeopathy software program and then couldn't remember how I came across it in the first place.

It has been enjoyable, using it and watching the development and fine tuning.

I think you are in the best place - ie the warrior forum, for reaching testers who will be loyal (actually use and stay with the testing) - and have a quality audience.

You can look for others via google - adwords - which does of course cost you and also facebook ads.
You may not want to pay anything to find your testers (I'm sure you don't but its is worth consideration at least). The benefits to using these platforms are that you can really target interest groups and track conversions, so you get info on what is working for you - including keywords. You don't need many testers but you do want them to be quality.

As I said above, this is the best forum I'm sure for you to use to find your people, but other forums could find you a few more - interest groups specific to your use.

And there are Beta directories. I haven't used one, but I have heard that they exist. Has anyone else used them that can tell us about them?