http://freebtcglcw7bnv6uw6zuf5c3nip77k3cmoxemfjmnoiqlnrjuux4rad.onion/instructions
Import process is equal for both. Select a "New/Restore" option from the menu, choose the wallet name, e.g. "Imported_Wallet". Then choose the "Import keys" option, on the next step you will be asked to insert the private keys.