@antoninomc Hello and thanks for your time and all of the information,
I don't think that my problem is associated with the model not been loaded, cause I 've tried to load it various times (even before I start this topic) with various different models and the option Point Sensor Tool is still not available. {When I press "load model" nothing happens....is that normal?}
As for the (New Settings) -> Point Sensor option, i have tried it various times as well and it seems that dragging and dropping the neuron/axon into the "Point Sensor Settings" is prohibited. Here is a screenshot :

Also, I do understand why Point Processes and Network Connections are not needed for this EM Stimulation tutorial and my question was referred to their absence in a screenshot that I saw when I was reading the tutorial. But that 's not my major concern right now.
If it helps I tried to complete the Neuronal Networks and Connections tutorial and the same problem appears when I reach into the Sensor Setting, in which after I select New Settings -> IClamp …...and drag my axon from the modeler, I can't drop it into the Point Process Settings (same as in the EM stimulation).
Lastly, I did download again the NEURON from Yale and installed it in the sim4life light folder. The name of the installed folder isn't neurons4l but "nrn" . Is it the same ? Cause if it is, then that wasn't the problem cause I still can't put sensors on axons in any of my models.
Thanks in advance,
Christos