In order to change your company logo, select Subscription :-
Select Company Details and click Change Logo under Actions on the right hand side:-
From here select Upload an Image File, click Choose File to select the logo image, click OK and then Save:-
Your file will need to be an Image File i.e JPEG, PNG, IMG format or similar.
Please note: If you cannot see anything other than the option for Profile you will not be able to perform this change. You will need to contact your system Administrator to do this.