here's a PDF containing lots of quick guides of the FX / QX 70
https://owners.infinitiusa.com/content/manualsandguides/FX/2014/2014-QX70-quick-reference-guide.pdf
Automatic Drive Positioner (if so equipped)
Two positions for the driver’s seat, steering column and outside mirrors can be stored in the automatic drive positioner memory.
SEAT MEMORY CONTROLS (if so equipped)
Follow these procedures to set the memory positions:
• Confirm the shift lever is in the P (PARK) position.
• Push the ignition switch to the ON position.
• Adjust the driver’s seat, steering column and outside mirrors to the desired positions using the adjusting switches for each feature.
• Push the SET switch and within 5 seconds, push the memory switch (1 or 2) for at least 1 second.
• The indicator light on the memory switch you select will illuminate for approximately 5 seconds.
• The driver’s seat, steering column and outside mirror positions are now set to your preference.
These memorized positions can also be linked to your INFINITI Intelligent Key.
For more information, refer to the “Pre-driving checks and adjustments (section 3)” of your Owner’s Manual
EDIT , just noticed you have a 2008 FX next to your name. Time to update.