In order to upload your own playlist, you need to generate Connection Code in SS IPTV settings and enter it on this page above
No, Playlist Editor keeps connection with your device untill you disconnect it on this page or in SS IPTV on device's side
Just drag the item on the any position you want using drag'n'drop faeture
You can do that using item's options. Pres Pencil button near the item you want to change and select item's size and background. You can also define there many other options as Logo URL, Standardized Name, Audio Track etc. The certain list of item's options depends on its type.
Displayed Name will be shown on the screen in SS IPTV (if Use custom channels' titles option is turned on in app's settings). Standardized Name defines channel's logo and EPG (if available), it also will be displayed in the app if the option Use custom channels' titles is turned off.
SS IPTV scans the channels tuned on your TV automatically if this option is available for apps on your device. On broadcast tab you can arrange scaned channels: define items' sizes, positions, Standardized Names etc