Recently modified my plan- need to make another change- currently says "There’s an order that is being processed."

Hi!  I recently made some changes to my account and decided I'd like to change one of them back, but it appears I'm unable to do so.  I see "There’s an order that is being processed." on my profile.  It states that I can modify my order, but I'm unable to get any changes to go through.  I continually get an error.

Thank you!