If you meet the eligibility requirements, and if your school has a chapter of Pi Sigma Alpha, you should find out from the Chapter Advisor or Department Chair the procedure for becoming a member.  Students may NOT "join" Pi Sigma Alpha through the national office, but may only become members through their campus chapters.

Usually the Chapter Advisor and/or student officers of a chapter will advertise within the department when a Pi Sigma Alpha initiation is coming up.  Students who feel they qualify, and who want to become members of the honor society, will then follow the procedures set by their chapter.  The process may involve signing a release so that your academic records may be looked at by the chapter's student officers; if only the Chapter Advisor will see your records, no release will be required.

If you know your school has a chapter of Pi Sigma Alpha but you believe it to be inactive, you should speak to your Department Chair abour reactivating it.