Back and forward button for mouse

I am pretty new to OS X so please forgive my idiocy I have been using a Logitech LX7 cordless mouse with the new iMac and it installed with no problem. However I became very used to the back/forward features of the 3rd and 4th buttons. Right now I have the 3rd button configured for double click because the back function is not available from the menu. Has anyone configured these features for their mouse?

Also on the keyboard. How does one configure the end/forward on the keyboard to go to the end and front of a line of text?

Thanks in advance for your input!