A manual written by Nilam Ram can be downloaded here.
This instruction will represent how to install and use DFA.
1.Install DFA
Step 1. Double click the setup file setup.exe.
Step 2. Click next.
Step 3. Choose the directionary you want to install DFA. 
Step 4. Choose the folder where DFA will show in the START menu.
Step 5. Click install to setup the program.
Step 6. Click finish and open the program.