FujiFilm Quality Dry Photo Paper for Frontier-S DX100 Printer (Glossy, 4" x 213' Roll, 2-Pack) - Manual (Page 44)

B
When the length of the print size is 102.1 to 254 mm, hook the hooks into the upper hole.
When the length of the print size is 254.1 to 305 mm, hook the hooks into the lower hole.
Removing
Perform operations in reverse order from attaching the parts.
Frontier-S Operation Guide
Ejecting Paper
44