Urgent Help needed

Ive spent weeks editing my site to be just right only to find out that users can’t register under different currency codes.. they are forced to use mine ( $ usd )..

how do you build an auction theme and not allow users from around the world to sell there? baffles me
most of my target market is in UK and im home based in US so they are all mad they cant select their currency, does anyone know a solution for this?! and yes i know paypal converts..

Im having an issue getting addthis to work.. its horrible, i modified my own addthis account to be an inline share button setup and added my username to the section of my editor but nothing ever changes on my site.. my users want the ability to link their social accounts.. is this possible? should i just disable addthis integration and use the addthis plugin instead?