Currency conversion allows you to multiply the MSRP of an item by your conversion rate in order to set your price on an item automatically.
You can set your currency conversion rules and rates on the MORE>CATEGORIES + TAXES page. The CURRENCY CONVERSION column lets you set the default rate for each category. If the category is set to 1.0, your transactions will charge MSRP for an item. If you want to set a custom price for an item, click the edit icon next to the item's MSRP within the item page, and you can tell CSA to NOT convert currency and then assign a custom price.
You can also edit these pricing rules for items in bulk from the ITMS>ITEMS page, using the Bulk Edit tool.