What is thumbR? thumbR is a program that allows you to add your own page describing you. This can be helpful for references, extended bios, and everything in between. How do I use thumbR? Go to the forum below and make a post with a link to your project. The project should have one backdrop, which will be your reference. You could also post your project in the studio. Here's the forum topic: https://scratch.mit.edu/discuss/topic/859558/