Prostate massage with the Dr. Joel Kaplan Power Probe

Hi. New here.

I've always wanted to try prostate massage but I've never had any success trying to do it manually, either I can't find it or it doesn't feel good due to be in awkward position in order to reach. So I decided to buy a prostate massager and when I saw the power probe in the 2 for £20 I thought I'd get it. It arrived today and I immediately decided to give it a try. I managed to use it but I was unsuccessful in getting anywhere with it. I don't even think I'm managing to hit my prostate with it as I think the probe is turning around when I put it in. The pointy bit that's supposed to be a making contact with the prostate I make sure is facing forward when I insert but it seems to be turning round and ending up pointing back, either that or I'm just not doing it right/not finding the right spot.

Does anyone have any advice on how to make sure it stays the right way or any advice in general on making sure I'm making contact so to speak.

Many thanks in advance for any help you can provide