Hi @EMertCakir,
Table 6 shows the connection of a 18 bit per pixel LCD. In that case, pins D17, D16, D9, D8, D1 and D0 end up being left over.
From what you mention, I believe you are using 24bpp, so the RGB connections would equate to the values shown on "Figure 1. Data for 1 pixel" (D7-0 Blue, D15-8 Green, D23-16 Red):

BR,
Edwin.