I appreciate you for integrating your PayPal account to QuickBooks Online, -wildskygear-co-. I know it can be difficult when you have a different amount on your register after importing the transactions. I'm here to assist you with that.
Before proceeding, may I know what version of QuickBooks Online you're using? This way, we'll be able to determine why you're unable to use the Multicurrency feature.
The foreign currencies are available in QuickBooks Online Essentials and Plus. If you're subscribed to the Simple Start version, I'd suggest contacting the PayPal Support Team. They'll be able to help you change the transactions to the correct currency.
To learn how to review your downloaded bank and credit card transactions and put them in the correct accounts, I'd suggest checking out this article: Categorise and Match Online Data.
Additionally, I've included these articles that'll help you learn how the Multicurrency feature works in QuickBooks Online:
I'm only a few clicks away if you need assistance with your other QuickBooks tasks, -wildskygear-co-. It's always my pleasure to help you out again.