You'll want the 4-wire serial mode (easier SPI mode, with Chip Select (CS), Data (MOSI/DO), Clock (CLK), and the fourth pin is a generic I/O pin that determines Command/Data mode), right?
For jumpers 9-16, you short the even ones and open the odd ones (short J10, J12, J14, J16; open J9, J11, J13, J15).
You also need 10kOhm resistors at R1, R2, R3; 0Ohm resistors (shorts) at R35, R36, R37, R38; and leave R39, R40, R41, and R42 unpopulated.
The resistors that are used to determine the mode are R1, R2, R3, R35, R36, R37, R38, R39, R40, R41, R42.
BuyDisplay/EastRising says they put 0R resistors (shorts, or links; they do look like normal resistors, but have a 0 on them) at R39, R40, R41, R42, and leave R35, R36, R37, R38 unpopulated.
Looking at the pictures, the resistors look like 0805 size. You can verify that by measuring the existing resistors with calipers in millimeters:
1.0 mm × 0.5 mm = 0402
1.55 mm × 0.85mm = 0603
2.0 mm × 1.2 mm = 0805
In inches, 0402 is 0.04"×0.02"; 0603 is 0.06"×0.02"; and 0805 is 0.08"×0.05". Measuring the length of the resistor itself suffices, and you don't even need to be very precise.
I recommend getting an SMD Resistor Sample Book. They contain a bunch of different SMD resistors in different sizes, and come in handy in a situation like this. Otherwise, you need one 0Ohm resistor/link and three 10kOhm resistors in the existing size; get 10 of both to be sure.
The resistor positions are marked on the board. R1, R2, R3 are the three leftmost ones in the group of four near the upper left corner of the board, and R35-R42 are below those in a group of 8 resistors, two columns by four rows, directly right of the widest connector.
So, what you need to do, is remove R1, R2, R3, and replace them with 10 kOhm resistors.
The three 0Ohm resistors, and an additional one, you put at R35, R36, R37, R38 (the column of four resistors nearest to the widest connector). The other four, R39, R40, R41, R42 you leave unpopulated.