Nanuky, please, see the attached screenshot and specify how should be changed the Dialogue window position.
For example, if you change the textchat position and fix it in the upper right corner,  the system will still display the Dialogue windows at the bottom.



So, if you want to change the position for the textchat only, you can use the next CSS code modification.  
 Go to Admin Area>Appearance>Edit Theme>CSS tab and add code: 

.ow_chat_block_wrap {position:fixed !important; right:10px; top:40px}