If you want to go for IQAS, you need to fill below request form and send it to PTU, to send your transcripts directly to IQAS.
https://www.alberta.ca/documents/IQAS/academic-records-request-form.pdf
I have attested transcripts in sealed envelope issued by PTU, can I send them directly to IQAS in my application package, instead of requesting PTU to send it for me?