How do I post expenses that were paid in a different currency?

Have you generated expenses abroad and now want to post them in KLARA, but can’t find any way of selecting EUR or USD? 

You can convert cash payments into CHF at the monthly mean rate published by the Swiss Federal Tax Administration (ESTV) and credit them to your interest-bearing current account.

https://www.estv.admin.ch/estv/de/home/mehrwertsteuer/dienstleistungen/fremdwaehrungskurse/monatsmittelkurse/aktueller-monatsmittelkurs.html (Sorry but there is no english link available)

In the case of credit card payments, you can take the CHF amount from your credit card bill and use that.