You can join PSO by going to our forums, register an account and then post your application by filling in the given application form on the forums. Those who are not familiar with our forums may find it useful to read through the next part.

-Click here to go to our forums.
-Click on register on the right rop of the page, just under the banner.
-Enter a username, could be your RS name
-Enter ANY e-mail, you can even enter fake ones! Just make sure you enter something such as "herp@derp.baa"
-Enter your current RuneScape Name (Rsn)
-Agree with the terms and press submit

Once you've got an account and you're logged in on our forums, read the following topics:

- Application Form & how to apply ~ Read this and copy the form
- Sample application ~ In case you don't understand something
- The rules of PSO ~ You must carefullyread these!
- Guide for uploading screenshots ~ In case you don't know how

Once you've done all that, make a newpost (by clicking on the big green button 'new topic') in THIS section.

Once you've made an application, it's time to read 1 more topic:
- Information about your trial

If this guide didn't help you at all, please ask other people to help you, but I doubt if that would be necessary