Thanks so much! I definitely won't ask an On-site to use discord. I'll keep to Off-site parts of the posts for that kind of stuff.Off-site roleplays are allowed but still require you to follow all of BlueMoon's rules if the play was started through this site. In any case, there is a separate section for request threads that deals with Off-site versus On-site so make sure you are posting in the correct area.
Asking people who are posting in the On-site to try and use Discord can generally be rude, yes, but most people aren't going to get mad about an honest question so long as it isn't already answered in their post.