You will be able to donate to the team of your choice by navigating to the event page the team is associated with.
The first screenshot: This shows the event page and the button to donate. You will want to select the donate button on the event page.
The second screenshot: This box will populate and you will be able to select "Choose a Team". Then another drop box will appear and you can choose the team you wish to donate to. This will then take you directly to the team page you chose.
Keep in mind, your donation will only show on the team page, not on the individual team member pages.