RP, or Rating Points, are gained for every 30 minutes one spends online on Monster Hunter Frontier.
There are two uses for RP. First, you can donate them to the guild, which helps us grow, allowing us to accept more members, and eventually bestowing additional benefits, such as a guild store. All guild members are encouraged to donate all or as much RP as possible.
The second use is to "purchase" materials on the hangame site. Click here to visit the RP shop. Note that the pricing listed is actually in "points", which, while based on RP, are not valued the same.