Hi, Joshua,
I wasn’t able to tag you for some reason so hopefully you find this response. This is how to cancel your IAPWE membership directly with PayPal. I hope it helps!
1. Please log into your PayPal account using the PayPal email address associated with your IAPWE membership
2. Select the 'Profile' menu item in your PayPal dashboard
3. Select 'Profile and settings' in the drop-down associated with the 'Profile' menu item
4. Select the 'My money' option under the PayPal 'My Profile' menu options
5. Select the 'Update' button next to the 'My preapproved payments' menu item
6. Select the link that says 'IAPWE' under the 'Merchants' column
7. Select the 'Cancel' link next to 'Active' underneath your Billing ID