Look at the left side panel and click CoopWallet.
Click on Member to Member Transfer.
Make sure you have Setup your Google Authenticator Account by following the steps before proceeding any further.
In the Member to Member Transfer screen, you can see your Available Balance, to be sure you have the funds to transfer to another member.
Enter the Donor Key
Enter the amount that you would like to transfer.. 
Then, click on Confirm Transfer.