Open the .ini file in a text editor. Try double clicking it, the file type may already be associated with notepad or something similar and open in a text editor already. When it opens it will be a series of instructions, the instructions automatically are written to the .ini file to save your preferences in PLC whenever you close the program. For example, you have certain graphs that you like to use, if you close PLC with those graphs selected then the next time you open PLC those graphs will already be selected since PLC will refer to the .ini file the next time it runs.
So you will scroll down to the analog set of instructions in the .ini and enter the specifics for your transducer (I give mine a unique name so I can find it later). Click on file, save, then close the .ini file. Open PLC then select your analog gauge (here is where the specific name comes in handy) in the file/config setup page in PLC.