Where do I enter or change my PayPal details?

Log into your Watch Me Think account

https://watchmethink.com/account/login

Then go to:

https://watchmethink.com/contributor/edit-profile

(This is under your name and picture at the top right of the page.)

Then click on the "Personal Details" tab.

There you will see your PayPal account information, just enter or change your PayPal account email address and save (button at the bottom of the page).

All done.