Thanks everybody for your responses. They help me feel that I am not a complete idiot! I was mistaken about the changes being allowed within 24 hours, but I was pretty sure I was right about cancellation being allowed within 24 hours. I am booking for two people from two different states who want to travel together to Europe together (a friend and I) and open-jaws. And one-way flights TO the US on WOW have to be booked as two tickets, Europe to KEF, KEF to US. AND our plans weren't totally pinned down. So you can see this was rather complicated (for me, anyway), and I made sure that I had 24 hours to cancel if needed. I also did the buying over several days because I never had enough time at one shot to do it all.
Carol, by now I have bought 6 tickets from WOW and haven't seen a cancel button yet!
Lee, I'm not sure how the link to Onetravel fits in here?
Anyway, I bought the first ticket one evening. An hour or so later I realized that that one wasn't going to work. I also realized that I was going to have to stay up till midnight to cancel it. I bought a couple of more tickets. At midnight I called in and cancelled the first with no problem.
The next afternoon after getting home from work I continued to work on the project and also reviewed what I had already purchased. At that point I realized that even if I wanted to cancel the tickets bought the night before (before midnight), I wasn't going to be able to because the 24 hour period would be up before Customer Service would open.
At this point I was definitely locked into flying WOW. So I thought about the last tickets I needed to buy and realized that the weekend was coming up and Customer Service wouldn't be open at all within the next 24 hours.
That's when I posted here to see what other travelers thought. Anyway, the tickets are bought. I am not really unhappy with how it worked out, but it all seemed strange to me!
Thanks for "listening"!