You need to be a Farm Owner to upgrade your farm plan.
How to upgrade
Head to account.fieldmargin.com where you will see a list of all your farms
Choose the farm you would like to upgrade and click 'Upgrade' / 'Manage' (which of these you see depends whether you have an active trial)
If you haven't had a free trial of Pro on any of your farms yet, you will see an option here to start a 14-day free trial of our Pro plan.
Select the plan you would like to upgrade to by clicking 'Choose this plan'.
Enter your billing address as you would like it to appear on invoices, then add your card payment details.
Click 'Upgrade' to confirm your choice and process your payment.
When you open the app again, you will see that the features for your farm's new plan are unlocked - happy days!