The OHALAH Bylaws are available here. Membership provisions are contained in Article III (3). Below are membership provisions that may be relevant for you to know at the time you apply.
Dual Membership in OHALAH
Paragraph 3.2.1 of the OHALAH Bylaws provides: Any member of OHALAH may also be a member of another Rabbinical Association, in accordance with the rules and procedures of that Rabbinical Association. However, a member of OHALAH who is also a member of another Rabbinical Association may participate in OHALAH placement only to the extent authorized by, and in accordance with the policies of, that Rabbinical Association and the policies established by the Board of Directors of OHALAH from time to time.
Associate Membership in OHALAH
Paragraph 3.2.2 provides: If a member of OHALAH is simultaneously a member of another Rabbinical Association that does not permit full membership in OHALAH, said member shall automatically be deemed an Associate Member of OHALAH. An Associate Member may vote and serve on a Committee but may not serve as an Officer or Director or participate in any placement that OHALAH may offer.
Student Membership in OHALAH
Paragraph 3.2.4 of the OHALAH Bylaws provides: A Student Member may vote but may not serve as an Officer, Director or member of the Ethics Committee or Membership Committee.