Missing manage currency option in set-up
I just enabled 'Allow Support to Activate Multiple Currencies' from company Information
I am using developer ORG
I don't think you could request for Multi currency in DEV org because this edition of salesforce is exceptionally used as play ground & you can't expect salesforce will give you additional features on request.
Multi-currency can enable in the org by raising case on support and from Dev Org , this feature is disabled now.
To play around Multicurreny , use sandboxes and production and the process to enable currency is in below URL. https://help.salesforce.com/apex/HTViewSolution?id=000003638
I had this issue recently. Steps to resolve:
Response was:
Hello, we have activated multi-currency for this account.
Multicurrency will take some time to get activated.
You will need to raise a case with salesforce support explaining why you need this feature .
Once it's approved ,it will be activated and you will see various options to manage currency