Hrm, did you upload your preset's .fhp file to a file-sharing site (like mediafire.com)? You have to give this link to your friends, that way they can download your preset's .fhp file and put it into their Presets folder, and only then they'll be able to see your preset.
As for your character being solid white, it may be that your non-preset/custom character is wearing markings they may not have downloaded.