/warp rankup in prison is the only way to level up. On the top there is a sign notifying players that they have to double click the sign to rankup but there is no sign notifying the players that if they accidentally double click a sign they will end up wasting their money on that rank. So my suggestion is for staff members to add a sign stating that so that players who are newer to the entire ranking up system don't accidentally rank up to c-prisoner twice and waste a lot of money and more importantly; a lot of time. Leave a support or a no support in the comment section if you agree with this suggestion. Thank you for reading this, have a good night/day.
You won't lose your money on that rank if you double click the sign. There is a cooldown on the sign that prevents you from double-clicking. It also requires a confirmation to rankup.