How can I have users make a page the start page within a website. For example, we have a several tabs (category A, category B, ...). One user wants their start page A the other B when they visit our website. I want to put a button or link saying "Make this page my starging page". Once they click that link, whenever they visit our website, category B will be the first page they see. I understand if they clear cache, it will be gone.