Just scan your boarding pass and e-ticekt receipt and email it to OnePass service center, in general, this should take just a couple days.

To do it the other way around (Fly CO but credit miles to TG) is super retarded, besides having to submit original boarding passes and copy of ticket receipt to ROP office, TG takes pretty much no responsibility of it and will pass the documents to CO to verify and CO will need to credit the miles. This whole process can take up to 3-4 months.