Missing values in Data

#1
So i have a Gender variable in my data set with one missing value. I am very confused regarding what to do with the missing value. what am i supposed to do with the system missing values?
Similarly i have other variable that use likert scale. These variables also have 3 to 4 missing values while some of the variables have user missing values such as 22.

please help
 
#4
I think this depends on how much you care about those cases. If you really do care and think it is highly important to keep them for some reason, I think SPSS has various methods of imputing missing data (I assume using regression/classification methods). However, you have such a small % of missing data I would just say analyse without them in there and report that they were excluded due to missing data