Q. How do I participate in Butler student Psych studies?

SONA!

https://butler.sona-systems.com/Default.aspx?ReturnUrl=%2f

Go to the above site and enter your student ID and class information before signing up for a time to study.  If you have trouble entering the site then you should contact the professor that you are trying to receive credit for.

Note that you must request an account each new semester!