A single point is run by just using 0 cycles. To read in a configuration you can use the Restart-file (see manual).
A quick way of creating that file is to use 0 cycles and create a single molecule. That will write out the Restart-file containing (some) atomic positions of the molecule.
You can then edit this file, read it in, and run for 0 cycles to compute a 'single point' energy.