You can easily change your daily budget through your Cobiro Dashboard.
If you use Cobiro for e-commerce, log into you Cobiro account and click on "Settings" in the top right corner. Then click "Configure" and the edit button under "Set Budget" to modify your budget.
If you use Cobiro for websites, go to your Cobiro Dashboard and click the "Configuration" tab. Click on the small pencil on the right to modify your daily budget. The new budget will be immediately applied once you change it.