There's an existing thread with the same topic as this one but the difference is that the old one doesn't have any images to make it more easier to follow since there's an image showing where you can find what you need to navigate on the forum. Well, you should include the character limit on each rank so that they will know that some signature designs are not suitable for other ranks. Anyway, in my point of view is that you are trying to help jr. members how to change/add signature which is for jr. member to be able to join sig campaign.