This system is not correct for your water. Softeners should not be used for low levels of iron removal, let alone high levels of iron removal. It is extremely wasteful, innefficient,...
Please consider getting an iron removal system. Even a cheap birm system, assuming you have no hydrogen sulfide and you have some oxygen in the water, would likely work. A pyrolox system would almost definetly work asuming you have enough water to backwash it. The softener has to be adjusted for the iron, and you should never do low salting on a softener with water that contains iron. According to your numbers, you will be using 2-3 times the normal amount of salt.
That being said, it can be programmed as follows, but... it is a bad idea.
Set the time to 12:01 P.M.
wait 15 seconds
press the up and down arrow buttons simultanesously for 7 seconds to enter the master programming mode
Set the valve type (VT) to ST1B
press the regen button and release to go to next setting (repeat this after every programming mode)
Set CT to Fd
set C to 36 (this is 36000 total grain capacity, this is set low to attempt to keep the iron fouling down and since iron fouling will occur, the capacity of your system will diminish to this level anyway )
H set to 45 (hardness will be set to the actual hardness if you remove the iron first, otherwise a 5 grains per ppm of iron is added.. 18 grains + (5x5ppm Iron) = 43
RS set to SF
SF set to 25, (your system is to small due to the high iron levels, making this system very innefficient thus requiring a higher than normal safety factor)
DO set to 5 (this is usually set to 15, since you have high levels of Iron, you do not want the resin soaking in iron fouled water for days on end, again, this will make the system waste a lot of salt if you are away for any length of time)
RT set to 2:00 (leave as is)
BW or B1 set to 15 minutes (usually set to 3-10 minutes, but since you are using the softener as an iron filter, aggressive backwashing is required)
BD set to 60,
RR set to 5
BF set to 12 ( this will cause the system to regenerate with 12 pounds of salt per cubic foot, this is extremely wasteful but since you are using the system as an iron filter... sigh..., many people would recommend setting the salt to 15 pounds per cubic foot. I dont necessarily disagree. Without iron this would be set to 8 minutes or 8 pounds of salt per cubic foot.)
FM set to t0.7 ( leave as is)
Here are the basic numbers for your efficiencies
With iron removed prior to the softener,
2 people X 70 gallons X 18 grains hardness = 2520 grains per day / 36000 grain system when set properly, = 14 days between regenerations. -15% for variables = approximately 12 days between regenerations.
30 regenrations per year at 12 pounds of salt per regeneration = 365 pounds of salt per year. Approximately 1 pound of salt per day.
With current design and iron levels , 2 people x 70 gallons x 45 = 6300 iron adjusted grains per day / 36000 grain system (iron adjusted again) = 5 days between regenerations, -15% for variables= 4 days between regenerations.
91 regenerations per year at 18 pounds of salt per cubic foot = 1638 pounds of salt per year. Approximately 4.5 pounds of salt per day.
And we wonder why our industry is being so heavily regulated. This type of waste is unnacceptble. Yes this s the way we did it 20 years ago, we also drove cars that got 6 miles to the gallon.
As I have been saying for nearly 20 years, do not use softeners for iron removal.