The minimum amount of information you should enter is
The marker can be enhanced with information about death or twin status, and a sibship can be grouped in two half-sibship groups.
If information about the spouses is available, a marker can be defined together with martial status, but this is completely optional. You enable the spouse marker by checking either Spouse 1 or Spouse 2. When you have done that you can select what marker should be used for this person, just as you do for the family person.
The Parent button will jump you to the parent of this person.
The First sib button will jump to the first person in the database that has the same parent (this could be this person). You can then use F3 (or Find Next) to jump through the sibship.
The First child button first will similarly jump to the first person in the database that has the current person as parent. Again, use F3 to jump through all children.