Reinstall protective plate - ignore if doing a flush - snug the bolts down, I didn't use a torque wrench, afaik there is no torque specification.
To flush the transmission:
Flushing the transmission basically means doing the change twice, run the vehicle in all gears for a couple of minutes, or go for a drive, then repeat steps above except do the ones I told you to ignore, you will work it out, note as mentioned that when you have replaced the strainer you will need to add more fluid you did than for just a fluid change