You get to a menu that looks like this:
TestDisk 7.0, Data Recovery Utility, April 2015
http://www.cgsecurity.org
Disk /dev/sdb - 4009 MB / 3824 MiB
Please select the partition table type, press Enter when done.
>[Intel ] Intel/PC partition
[EFI GPT] EFI GPT partition map (Mac i386, some x86_64...)
[Humax ] Humax partition table
[Mac ] Apple partition map
[None ] Non partitioned media
[Sun ] Sun Solaris partition
[XBox ] XBox partition
[Return ] Return to disk selection
Select "[Intel ] Intel/PC partition"