I would start by checking the site on your own smartphone. See if the pages load quickly, if navigating between sections is convenient, and if pop-ups are blocking the content. It is https://bp-9.my/ also useful to check whether the rules and help information are accessible without unnecessary extra steps. If a separate app is offered, make sure the download source is official. It is better to spend a few minutes checking beforehand than to run into inconveniences later.