How to use Arduino R3

I have Arduino R3 how do i selct this because it is not an option? Also, Hello my name is Colby. I have a science fair next week and just ordered round force sensitive resistors and do not know how to work them. I have an Arduino too. My project is to drop a sandbag on a helmet and test the force. How do i code this

Select "Arduino/Genuino Uno".

That did not work it has a red x next to it

What kind of R3? UNO, DUE.....

oconnorco22:
That did not work it has a red x next to it

Did you install the plugin?

Is the plugin running?

It worked but still how do you get the correct code