|To access a free WIFI service first you have to have a wireless NIC in your PC and then be within range of the free service transmission point. Hence the recommendation you use a local library.|
And as to the misunderstanding of your initial question, You asked "How does one access a remote pc via its ip Ad"
That is not the same as "How does one access a free WIFI service" To access a remote PC you need an internet connection ( which you say you can no longer afford) and the remote PC must be configured to allow you to connect.
So to answer you fully the first question would be are you using a laptop or desktop system? ie are you fixed or mobile? If fixed your options are limited.
If you cannot afford to keep paying for a broadband service perhaps you can afford a dialup. It is slow but cheap. You may very well be able to detect any unsecured wireless networks in your immediate vacinity but accessing someone else's internet that way may offend your sense of morality. It does mine.
If you are mobile then you will have to find some free local hotspot such as a library or Maccas cafe.
Goin' Fishin' (Some day)