Now that you've got your referee in mind, it's time to ask them if they'll be willing to sing your praises. Be confident and clear about what you're asking for, and make sure to give them all the details they need to know. You can say something like, "Hey, I'm applying for this amazing opportunity and I was wondering if you'd be willing to be my referee?"
Remember, the worst they can say is no, and if that happens, don't take it personally. Just thank them for considering it and move on to the next person on your list. And hey, if they say yes, be sure to thank them and offer to provide any information they need to make the process as smooth as possible.