Uhh... Chatter is an addon that modifies the chat frame. There is no special "Chatter frame". Just move the chat frame. Right-click on the first chat tab, select "Unlock Window", drag it to where you want it by left-clicking and dragging the first chat tab, resize it as desired by left-clicking and dragging an edge or a corner of the chat frame, and then right-click on the tab again and select "Lock Window". You may also need to select "Make Interactable" from the tab right-click menu, if you'd at some point selected "Make Non-Interactable". Also make sure that the "Simple Chat" and "Lock Chat Settings" options in the Blizzard Interface Options window are disabled. All of these are Blizzard settings present in the default UI; none of them have anything to do with Chatter, or are affected by Chatter.