Today I sent an email to a friend to saying that I could not to bemeet over Skype in this evening because I feelwas not goodfeeling well. Today I sent an email to a friend saying that I could not to meet over Skype this evening because I was not feeling well.

Today I sent an email to a friend to say that I could not to bemeet over Skype in this evening because I do not feel not good. Today I sent an email to a friend to say that I could not meet over Skype this evening because I do not feel good.

I'm sorry to hear this. I hope you feel better soon! We usually say "to meet over Skype." We don't need the "in" before "this evening" because "this evening" is the time you were supposed to meet. While Spanish puts the negative in front of the adjective to negate it, in English we use the "I do not" construction when we use a negative to describe how we're feeling.