In order to tip with the bot you need to deposit stellar lumens (XLM). Send any amount of XLM to:
In the memo, put: reddit/your-user-name
The memo is important in order to deposit. Be sure to always send a memo and use your own username. You will receive a private mail once the XLM is deposited.
Click here and change 'Amount' in the first line to the amount you want to withdraw and change 'address here' to your public key.
Hit send. You'll receive a message once the transaction is send. Important: This bot will never ask you for your secret key.