Please make sure that you have set the Chat user group permission "View chat".
If you have changed the position from the Chat admin option "Display mode" and the Chat is not displayed for you in the correct position, please make sure that you haven't set "Display mode" in your Chat user settings to a different value. Front Chat user settings override the admin settings.
In order to upload images, you have to add the Chat upload button to the editor from Admin Control Panel > Content > BB code button manager > Click to edit the toolbars
On the toolbar edit page, drag and drop the Chat upload icon from the top toolbar to the bottom one and save.
1. Check admin option "Enable rooms" .
2. Select a room for "Default joined rooms" admin option.
3. Set user group permission "Join rooms" to 1.
4. Set user group permission "Browse rooms" to "No".