Upgrade or Downgrade Your Plan
Log in to your HydroVu account.
Go to Account Management and select 'HydroVu Plan Management.' 
Choose from the available plan tiers: Free, Basic, Professional, or Enterprise. 
Plan Changes
Upgrades: These will take effect immediately. The entire month will invoice at the new rate.

Downgrades: These take effect at the start of the next billing cycle. Downgrades can be cancelled.

For information on updating your billing preferences, see Changing Billing Settings