SV06 Plus Extruder Grub Screw

Hi all, just got my 3D Printer, complete newbie to 3D Printing.

Have setup the printer, have 2 questions the manual says I need to tighten the grub screw in the Extruder ? Is this correct ?

Secondly the cable going to the filament holder is very tight is this also the case ?

Regards Kevin