Trying to use my own provided data

Good morning house,
It's me again; Still struggling.
Maybe I have been presenting my problem wrongly.
The thing is that I think I have a MULTIPLEXED PAIRED-END BARCODES IN SEQUENCE READ because I can only import my reads using the import command:
qiime tools import
--type MultiplexedPairedEndBarcodeISequence
--input-path muxed-pe-barcode-in-seq
--output-path multiplexed-seq.qza
With that command I get the file: multiplexed-seqs.qza.
NOW, HOW DO I CARRY OUT DEMULTIPLEXING AS NON OF THE COMMAND (FROM ATACAMA, OR MOVING PICTURES Tutorial) worked.
Thank you... And sorry for all the troubles.
Thank you.