Cant find anything that tells me how to set up ah bot

Can anyone point me in the direction of what i need to do so that my bot can use the ah?

 

Cant find anything about profession buddy other then the download area. Could you provide me witha link please?

 

so how would i set it so that it can quest on a main char. Then on the second char sell stuff with profession buddy and the ah profile?

 

doesn't mention anything about having the characters changed and then putting auctions on and going back to questing on the main char