You are now ready to run the software (assuming everything worked).
cd ~/units174
If you list the contents of the units directory, you will see a number of subdirectories.
To run the program, change to the bin directory and type
cd bin
./units
As an example, convert 6 feet to metres.
You have: 6 feet
You want: metres
* 1.8288
If you get the answer 1.8288, congratulations, it worked.
To stop the programm you can simply type ^C
To view what units it can convert between, view the data file in the share directory (the list is quite comprehensive).
To read the full documentation, change into the info directory and type
info --file=units.info