If history is any guide, your ticket number (016xxxx) is the key to your credit when you book future travel, which IME happens only by calling to ticket. To experiment, you can call and tickle the ticket number with the ostensible intention of booking future travel and then not complete the transaction once you know everything is in order.

If history is not a guide, the current process will be along shortly (apparently it is, thanks ). Last time I did it, as mentioned by another poster, the credit was good for a year from purchase, not date of travel, which proved problematic for me, since I had booked well in advance of travel date and cancelled last minute.

Good luck.