To transfer Postcard Credits to another HQ+ user, Click 'FUND TRANSFER' in the HQ+ menu, then enter the username of the person you wish to transfer the credits too, add the amount of credits and click 'TRANSFER NOW'
To check your transactions click Transactions in the HQ+ menu
Here is a guide to what the different types of transactions you will see:
'Received' - This indicates an amount of postcard credits you have received and who from.
'hq-postcard' - This indicates an ad-hoc postcard being sent from the 'Event Postcards' tool. It shows the recipient and the cost.
'FP BD card' - This indicates an automated birthday card being sent, the recipient and the cost.
'FP Review' - This indicates an automated review card being sent, the recipient and the cost.
'Transferred' - This indicates and amount of Postcard credits you have sent and the recipient.