Brax allows you to set Default Tracking Codes at both the Ad and Campaign level. Default Tracking Codes are automatically inserted into each Campaign and Ad you create. To set defaults, click on your Email Address in the top right corner, and click Tracking:
Enter your Campaign and Ad Level Defaults. Remember that Yahoo Gemini Campaign Tracking is entered at the Ad Level:
After you have entered your codes, click Save. They will be applied to all new Campaigns and Ads moving forward. IE: they will not be retroactively added to existing campaigns and ads.