Step by step:

https://steembottracker.com/

Login and Scroll down

Check Min/Max ROI -Don't bid on any negative (Duh!)

Choose a bot

Click "Actions" drop-down menu and check details

Check last round and current round to see if ROI's are consistent with colum

Check the bot's Min/Max bid and Vote Value 

Make a bid from the "Actions" drop-down menu