When someone has sent a ticket transfer you will receive an e-mail letting you know you have a pending transfer. If you already have a SeatGeek account, just log in to the app and accept the transfer.
If you do not have a SeatGeek account, you will be prompted to create one, using the same e-mail the tickets were transferred to, in order to complete the transfer and access your tickets.
More of a visual learner? Check out the videos above to learn how to send your tickets on iOS, Android, and desktop!