So I'm a noob to the PC version of this game so please cut me some slack for asking a noob question!

It's my first league game, I have 2 team re-rolls. First action so no other re-rolls have been used this turn and my block goes wrong. I have 15 seconds to select the result I want, however I want to use one of my team re-rolls. There's a card with a picture of re-rolls in the top right corner with "2" on it. I click on it, nothing happens. Right click, nothing happens. Timer runs out and I get the bad result.

How do I use the team re-roll!? Thanks!