You can rent hashing power on NiceHash and point it to Nanopool to mine Firo. To create an order on NiceHash you have to use the following settings:
Stratum hostname or IP: firo-eu1.picopool.org (or any other Nanopool's server)
Please keep in mind that you have to use an Firo address when creating an order on NiceHash, otherwise, you will not receive your reward.
NOTE: By filling your email address in, you will be able to receive email alerts from the pool each time your miner goes offline, otherwise, fill a passphrase instead to access the account settings.