I occasionally get emails asking how folks can volunteer to review for PRIMUS. [I know, volunteering to do free labor!]
If this resonates, you can add an account in the system (see the instructions below) or email me (primus.commseditor@gmail.com), Matt, or Kathy to ask us to initiate an account for you in our reviewer system.
But perhaps the best option would be to email the Subject Editors who oversee the areas of most interest to you. These areas overlap, and boundaries are unclear, so think of these broadly. Here is the Subject Editor team:
Joanna A. Ellis-Monaghan – Graduate and International Education & REU Practices

Ethan Berkove – Applied Mathematics

Rick Gillman – Programmatic Initiatives

Jess Ellis Hagman – Mathematics Education

Brian P Katz – Inquiry-Based Learning & Equity

Thomas Pfaff – Statistics & Data Science

Victor Piercey – Foundational Courses

Kathryn Weld – Upper-Level Courses

Sorry if the images vary wildly in size!
Instructions to add a PRIMUS Referee Account
1. Go to http://mc.manuscriptcentral.com/upri
2. In the “Log In” box, click on the “Create An Account” link.
3. Enter your name and email. Click “next”.
4. Enter your institutional information. Click “next”.
5. Select a password and enter at least two keywords for yourself that indicate your interests (this will help the editorial staff direct papers that interest you to you for review; broad keywords are typically more helpful than highly specific ones, and more keywords are more helpful than fewer).
6. Click “finish”.
Now you can return to the main page at http://mc.manuscriptcentral.com/upri and log in. Your email address that you entered in the system is your username; your password is the password you entered.